File ImageMagick-CVE-2017-7941.patch of Package ImageMagick.6947

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File ImageMagick-CVE-2017-7941.patch of Package ImageMagick.6947

From 721dc1305b2bfff92e5ca605dc1a47c61ce90b9f Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Mon, 17 Apr 2017 19:03:46 +0200
Subject: [PATCH] Fixed memory leak reported in #428.

---
 coders/sgi.c | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

Index: ImageMagick-6.8.8-1/coders/sgi.c
===================================================================
--- ImageMagick-6.8.8-1.orig/coders/sgi.c	2017-04-25 11:55:41.787382853 +0200
+++ ImageMagick-6.8.8-1/coders/sgi.c	2017-04-25 11:55:41.919384929 +0200
@@ -431,7 +431,10 @@ static Image *ReadSGIImage(const ImageIn
         scanline=(unsigned char *) AcquireQuantumMemory(iris_info.columns,
           bytes_per_pixel*sizeof(*scanline));
         if (scanline == (unsigned char *) NULL)
-          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
+          {
+            pixel_info=RelinquishVirtualMemory(pixel_info);
+            ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
+          }
         for (z=0; z < (ssize_t) iris_info.depth; z++)
         {
           p=pixels+bytes_per_pixel*z;
@@ -488,12 +491,11 @@ static Image *ReadSGIImage(const ImageIn
             (runlength == (size_t *) NULL) ||
             (packet_info == (MemoryInfo *) NULL))
           {
-            if (offsets == (ssize_t *) NULL)
-              offsets=(ssize_t *) RelinquishMagickMemory(offsets);
-            if (runlength == (size_t *) NULL)
-              runlength=(size_t *) RelinquishMagickMemory(runlength);
-            if (packet_info == (MemoryInfo *) NULL)
+            offsets=(ssize_t *) RelinquishMagickMemory(offsets);
+            runlength=(size_t *) RelinquishMagickMemory(runlength);
+            if (packet_info != (MemoryInfo *) NULL)
               packet_info=RelinquishVirtualMemory(packet_info);
+            pixel_info=RelinquishVirtualMemory(pixel_info);
             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
           }
         packets=(unsigned char *) GetVirtualMemoryBlob(packet_info);
@@ -503,7 +505,13 @@ static Image *ReadSGIImage(const ImageIn
         {
           runlength[i]=ReadBlobMSBLong(image);
           if (runlength[i] > (4*(size_t) iris_info.columns+10))
-            ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+            {
+              offsets=(ssize_t *) RelinquishMagickMemory(offsets);
+              runlength=(size_t *) RelinquishMagickMemory(runlength);
+              packet_info=RelinquishVirtualMemory(packet_info);
+              pixel_info=RelinquishVirtualMemory(pixel_info);
+              ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+            }
         }
         /*
           Check data order.
@@ -539,7 +547,14 @@ static Image *ReadSGIImage(const ImageIn
                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
                   1L*iris_info.columns,p+bytes_per_pixel*z);
                 if (status == MagickFalse)
-                  ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+                  {
+                    offsets=(ssize_t *) RelinquishMagickMemory(offsets);
+                    runlength=(size_t *) RelinquishMagickMemory(runlength);
+                    packet_info=RelinquishVirtualMemory(packet_info);
+                    pixel_info=RelinquishVirtualMemory(pixel_info);
+                    ThrowReaderException(CorruptImageError,
+                      "ImproperImageHeader");
+                  }
                 p+=(iris_info.columns*4*bytes_per_pixel);
               }
             }
@@ -569,7 +584,14 @@ static Image *ReadSGIImage(const ImageIn
                   (runlength[y+z*iris_info.rows]/bytes_per_pixel),packets,
                   1L*iris_info.columns,p+bytes_per_pixel*z);
                 if (status == MagickFalse)
-                  ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+                  {
+                    offsets=(ssize_t *) RelinquishMagickMemory(offsets);
+                    runlength=(size_t *) RelinquishMagickMemory(runlength);
+                    packet_info=RelinquishVirtualMemory(packet_info);
+                    pixel_info=RelinquishVirtualMemory(pixel_info);
+                    ThrowReaderException(CorruptImageError,
+                      "ImproperImageHeader");
+                  }
               }
               p+=(iris_info.columns*4*bytes_per_pixel);
             }

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