File ImageMagick-CVE-2017-15217.patch of Package ImageMagick.30956

diff --git a/coders/sgi.c b/coders/sgi.c
index e590ba84fc..e285a95e5d 100644
--- a/coders/sgi.c
+++ b/coders/sgi.c
@@ -652,7 +652,10 @@ static Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
           Create grayscale map.
         */
         if (AcquireImageColormap(image,image->colors) == MagickFalse)
-          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
+          {
+            pixel_info=RelinquishVirtualMemory(pixel_info);
+            ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
+          }
         /*
           Convert SGI image to PseudoClass pixel packets.
         */