https://github.com/ImageMagick/ImageMagick/issues/587

diff --git a/coders/mat.c b/coders/mat.c
index 240cedf79d6f3dbf26c0e67c76efa0ac9e271b95..cd8f0c72f3a1b09f046279d12a0b67738f69866d 100644 (file)
--- a/coders/mat.c
+++ b/coders/mat.c
@@ -1350,6 +1350,8 @@ END_OF_READING:
     clone_info = NULL;
   }
   if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),"return");
+  if ((image != image2) && (image2 != (Image *) NULL))
+    image2=DestroyImage(image2);
   if(image==NULL)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   return (image);