https://github.com/ImageMagick/ImageMagick/issues/592

Cristy · Cristy · commit 9fd10cf63083 · 2017-07-21T07:54:50.000-04:00
diff --git a/coders/gif.c b/coders/gif.c
@@ -1018,6 +1018,8 @@ static Image *ReadGIFImage(const ImageInfo *image_info,ExceptionInfo *exception)
     MagickMax(global_colors,256),3UL*sizeof(*global_colormap));
   if (global_colormap == (unsigned char *) NULL)
     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
+  (void) ResetMagickMemory(global_colormap,0,3*MagickMax(global_colors,256)*
+    sizeof(*global_colormap));
   if (BitSet((int) flag,0x80) != 0)
     {
       count=ReadBlob(image,(size_t) (3*global_colors),global_colormap);

Original file line number	Diff line number	Diff line change
`@@ -1018,6 +1018,8 @@ static Image ReadGIFImage(const ImageInfo image_info,ExceptionInfo *exception)`
`1018`	`1018`	`MagickMax(global_colors,256),3ULsizeof(global_colormap));`
`1019`	`1019`	`if (global_colormap == (unsigned char *) NULL)`
`1020`	`1020`	`ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");`
	`1021`	`+ (void) ResetMagickMemory(global_colormap,0,3MagickMax(global_colors,256)`
	`1022`	`+ sizeof(*global_colormap));`
`1021`	`1023`	`if (BitSet((int) flag,0x80) != 0)`
`1022`	`1024`	`{`
`1023`	`1025`	`count=ReadBlob(image,(size_t) (3*global_colors),global_colormap);`