File ImageMagick-CVE-2017-13139.patch of Package ImageMagick

Index: ImageMagick-6.8.8-1/coders/png.c
===================================================================
--- ImageMagick-6.8.8-1.orig/coders/png.c	2017-10-23 13:57:37.777361711 +0200
+++ ImageMagick-6.8.8-1/coders/png.c	2017-10-23 13:57:37.797362058 +0200
@@ -5701,6 +5701,8 @@ static Image *ReadOneMNGImage(MngInfo* m
 
             for (i=(int) first_object; i <= (int) last_object; i++)
             {
+              if ((i < 0) || (i >= MNG_MAX_OBJECTS))
+                  continue;
               if (mng_info->exists[i] && !mng_info->frozen[i])
                 {
                   MngBox
@@ -5772,6 +5774,8 @@ static Image *ReadOneMNGImage(MngInfo* m
             last_object=(p[2] << 8) | p[3];
             for (i=(ssize_t) first_object; i <= (ssize_t) last_object; i++)
             {
+              if ((i < 0) || (i >= MNG_MAX_OBJECTS))
+                  continue;
               if (mng_info->exists[i] && !mng_info->frozen[i])
                 {
                   MngPair