File ImageMagick-CVE-2026-25983.patch of Package ImageMagick.42998

From b4f8e1a387dd1d0a0af516071831a235f2fdf437 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@lemstra.org>
Date: Sun, 25 Jan 2026 18:49:10 +0100
Subject: [PATCH] No longer allow mutations on the first image of the list
 (GHSA-fwqw-2x5x-w566)

---
 coders/msl.c | 150 +++++++++++++++++++++++++--------------------------
 1 file changed, 75 insertions(+), 75 deletions(-)

Index: ImageMagick-7.1.0-9/coders/msl.c
===================================================================
--- ImageMagick-7.1.0-9.orig/coders/msl.c
+++ ImageMagick-7.1.0-9/coders/msl.c
@@ -694,7 +694,7 @@ static void MSLStartElement(void *contex
           /*
             Add noise image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || ((n < 1) || (msl_info->image[n] == (Image *) NULL)))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -770,7 +770,7 @@ static void MSLStartElement(void *contex
           /*
             Annotate image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1105,7 +1105,7 @@ static void MSLStartElement(void *contex
           MagickBooleanType
             stack;
 
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1169,7 +1169,7 @@ static void MSLStartElement(void *contex
           /*
             Blur image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1265,7 +1265,7 @@ static void MSLStartElement(void *contex
           /*
             Border image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1386,7 +1386,7 @@ static void MSLStartElement(void *contex
           /*
             Add noise image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1451,7 +1451,7 @@ static void MSLStartElement(void *contex
             radius = 0.0,
             sigma = 1.0;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || msl_info->image[n] == (Image *) NULL)
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -1526,7 +1526,7 @@ static void MSLStartElement(void *contex
           /*
             Chop image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1633,7 +1633,7 @@ static void MSLStartElement(void *contex
           /*
             Color floodfill image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -1765,7 +1765,7 @@ static void MSLStartElement(void *contex
           /*
             Composite image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2108,7 +2108,7 @@ static void MSLStartElement(void *contex
           /*
             Contrast image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2162,7 +2162,7 @@ static void MSLStartElement(void *contex
           /*
             Crop image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2264,7 +2264,7 @@ static void MSLStartElement(void *contex
           /*
             Cycle-colormap image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2317,7 +2317,7 @@ static void MSLStartElement(void *contex
           /*
             Despeckle image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2343,7 +2343,7 @@ static void MSLStartElement(void *contex
         }
       if (LocaleCompare((const char *) tag,"display") == 0)
         {
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2379,7 +2379,7 @@ static void MSLStartElement(void *contex
           /*
             Annotate image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2741,7 +2741,7 @@ static void MSLStartElement(void *contex
           /*
             Edge image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2807,7 +2807,7 @@ static void MSLStartElement(void *contex
           /*
             Emboss image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2886,7 +2886,7 @@ static void MSLStartElement(void *contex
           /*
             Enhance image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2915,7 +2915,7 @@ static void MSLStartElement(void *contex
           /*
             Equalize image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -2950,7 +2950,7 @@ static void MSLStartElement(void *contex
     {
       if (LocaleCompare((const char *) tag, "flatten") == 0)
       {
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -2981,7 +2981,7 @@ static void MSLStartElement(void *contex
           /*
             Flip image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3013,7 +3013,7 @@ static void MSLStartElement(void *contex
           /*
             Flop image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3048,7 +3048,7 @@ static void MSLStartElement(void *contex
           /*
             Frame image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3199,7 +3199,7 @@ static void MSLStartElement(void *contex
           /*
             Gamma image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3294,7 +3294,7 @@ static void MSLStartElement(void *contex
         }
       else if (LocaleCompare((const char *) tag,"get") == 0)
         {
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || msl_info->image[n] == (Image *) NULL)
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3425,7 +3425,7 @@ static void MSLStartElement(void *contex
           /*
             Implode image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3496,7 +3496,7 @@ static void MSLStartElement(void *contex
         double
           levelBlack = 0, levelGamma = 1, levelWhite = QuantumRange;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -3569,7 +3569,7 @@ static void MSLStartElement(void *contex
           /*
             Magnify image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3607,7 +3607,7 @@ static void MSLStartElement(void *contex
           /*
             Map image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3698,7 +3698,7 @@ static void MSLStartElement(void *contex
             Matte floodfill image.
           */
           opacity=0.0;
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3830,7 +3830,7 @@ static void MSLStartElement(void *contex
           /*
             Median-filter image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3898,7 +3898,7 @@ static void MSLStartElement(void *contex
           /*
             Minify image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -3932,7 +3932,7 @@ static void MSLStartElement(void *contex
           /*
             Modulate image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4061,7 +4061,7 @@ static void MSLStartElement(void *contex
           /*
             Negate image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4130,7 +4130,7 @@ static void MSLStartElement(void *contex
           /*
             Normalize image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4187,7 +4187,7 @@ static void MSLStartElement(void *contex
           /*
             Oil-paint image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4255,7 +4255,7 @@ static void MSLStartElement(void *contex
           /*
             Opaque image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4364,7 +4364,7 @@ static void MSLStartElement(void *contex
         }
         if (LocaleCompare((const char *) tag, "profile") == 0)
           {
-            if (msl_info->image[n] == (Image *) NULL)
+            if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
               {
                 ThrowMSLException(OptionError,"NoImagesDefined",
                   (const char *) tag);
@@ -4477,7 +4477,7 @@ static void MSLStartElement(void *contex
           /*
             Quantize image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -4955,7 +4955,7 @@ static void MSLStartElement(void *contex
           /*
             Raise image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5093,7 +5093,7 @@ static void MSLStartElement(void *contex
           /*
             Reduce-noise image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5155,18 +5155,17 @@ static void MSLStartElement(void *contex
         }
       else if (LocaleCompare((const char *) tag,"repage") == 0)
       {
-        /* init the values */
-        width=msl_info->image[n]->page.width;
-        height=msl_info->image[n]->page.height;
-        x=msl_info->image[n]->page.x;
-        y=msl_info->image[n]->page.y;
-
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
           break;
         }
+        /* init the values */
+        width=msl_info->image[n]->page.width;
+        height=msl_info->image[n]->page.height;
+        x=msl_info->image[n]->page.x;
+        y=msl_info->image[n]->page.y;
         if (attributes == (const xmlChar **) NULL)
           break;
         for (i=0; (attributes[i] != (const xmlChar *) NULL); i++)
@@ -5285,7 +5284,7 @@ static void MSLStartElement(void *contex
         x_resolution,
         y_resolution;
 
-      if (msl_info->image[n] == (Image *) NULL)
+      if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -5387,7 +5386,7 @@ static void MSLStartElement(void *contex
           /*
             Resize image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5482,7 +5481,7 @@ static void MSLStartElement(void *contex
           /*
             Roll image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5556,19 +5555,18 @@ static void MSLStartElement(void *contex
         }
       else if (LocaleCompare((const char *) tag,"roll") == 0)
       {
-        /* init the values */
-        width=msl_info->image[n]->columns;
-        height=msl_info->image[n]->rows;
-        x = y = 0;
-
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
           break;
         }
+        /* init the values */
+        width=msl_info->image[n]->columns;
+        height=msl_info->image[n]->rows;
+        x = y = 0;
         if (attributes == (const xmlChar **) NULL)
-        break;
+          break;
         for (i=0; (attributes[i] != (const xmlChar *) NULL); i++)
         {
           keyword=(const char *) attributes[i++];
@@ -5643,7 +5641,7 @@ static void MSLStartElement(void *contex
           /*
             Rotate image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5707,7 +5705,7 @@ static void MSLStartElement(void *contex
         /* init the values */
         double  degrees = 0;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -5772,7 +5770,7 @@ static void MSLStartElement(void *contex
           /*
             Sample image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5849,7 +5847,7 @@ static void MSLStartElement(void *contex
           /*
             Scale image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -5929,7 +5927,7 @@ static void MSLStartElement(void *contex
           /*
             Segment image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6013,7 +6011,7 @@ static void MSLStartElement(void *contex
         }
       else if (LocaleCompare((const char *) tag, "set") == 0)
       {
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",(const char *) tag);
           break;
@@ -6187,7 +6185,7 @@ static void MSLStartElement(void *contex
           /*
             Shade image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6278,7 +6276,7 @@ static void MSLStartElement(void *contex
           /*
             Shear image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6378,7 +6376,7 @@ static void MSLStartElement(void *contex
             radius = 0.0,
             sigma = 1.0;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",
               (const char *) tag);
@@ -6451,7 +6449,7 @@ static void MSLStartElement(void *contex
         width = height = 0;
         x = y = 0;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
         {
           ThrowMSLException(OptionError,"NoImagesDefined",
             (const char *) tag);
@@ -6542,7 +6540,7 @@ static void MSLStartElement(void *contex
           /*
             Shear image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6631,7 +6629,7 @@ static void MSLStartElement(void *contex
           /*
             Signature image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6663,7 +6661,7 @@ static void MSLStartElement(void *contex
           /*
             Solarize image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6725,7 +6723,7 @@ static void MSLStartElement(void *contex
           /*
             Spread image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6790,7 +6788,7 @@ static void MSLStartElement(void *contex
         Image *
           watermark = (Image*) NULL;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",
               (const char *) tag);
@@ -6858,7 +6856,7 @@ static void MSLStartElement(void *contex
         Image *
           stereoImage = (Image*) NULL;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",(const char *) tag);
             break;
@@ -6925,7 +6923,7 @@ static void MSLStartElement(void *contex
           /*
             Strip image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -6955,7 +6953,7 @@ static void MSLStartElement(void *contex
             index,
             swap_index;
 
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7021,7 +7019,7 @@ static void MSLStartElement(void *contex
           /*
             Swirl image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7085,7 +7083,7 @@ static void MSLStartElement(void *contex
           /*
             Sync image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7125,7 +7123,7 @@ static void MSLStartElement(void *contex
           /*
             Texture image.
           */
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7180,7 +7178,7 @@ static void MSLStartElement(void *contex
         /* init the values */
         double  threshold = 0;
 
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",(const char *) tag);
             break;
@@ -7225,7 +7223,7 @@ static void MSLStartElement(void *contex
       }
       else if (LocaleCompare((const char *) tag, "transparent") == 0)
       {
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",(const char *) tag);
             break;
@@ -7269,7 +7267,7 @@ static void MSLStartElement(void *contex
       }
       else if (LocaleCompare((const char *) tag, "trim") == 0)
       {
-        if (msl_info->image[n] == (Image *) NULL)
+        if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
           {
             ThrowMSLException(OptionError,"NoImagesDefined",(const char *) tag);
             break;
@@ -7303,7 +7301,7 @@ static void MSLStartElement(void *contex
     {
       if (LocaleCompare((const char *) tag,"write") == 0)
         {
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7393,7 +7391,7 @@ static void MSLEndElement(void *context,
     {
       if (LocaleCompare((const char *) tag,"comment") == 0 )
         {
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
@@ -7446,7 +7444,7 @@ static void MSLEndElement(void *context,
     {
       if (LocaleCompare((const char *) tag,"label") == 0 )
         {
-          if (msl_info->image[n] == (Image *) NULL)
+          if ((n < 1) || (msl_info->image[n] == (Image *) NULL))
             {
               ThrowMSLException(OptionError,"NoImagesDefined",
                 (const char *) tag);
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