File GraphicsMagick-CVE-2016-7101.patch of Package GraphicsMagick.7727

Index: GraphicsMagick-1.3.25/coders/sgi.c
===================================================================
--- GraphicsMagick-1.3.25.orig/coders/sgi.c	2016-09-05 21:20:23.000000000 +0200
+++ GraphicsMagick-1.3.25/coders/sgi.c	2016-11-29 15:48:55.816935334 +0100
@@ -299,6 +299,8 @@ static Image *ReadSGIImage(const ImageIn
   size_t
     bytes_per_pixel;
 
+  size_t count;
+
   /*
     Open image file.
   */
@@ -332,12 +334,16 @@ static Image *ReadSGIImage(const ImageIn
 
       (void) ReadBlob(image,(unsigned int) sizeof(iris_info.dummy1),
 		      iris_info.dummy1);
-      (void) ReadBlob(image,(unsigned int) sizeof(iris_info.image_name),
-		      iris_info.image_name);
+    count=ReadBlob(image,(unsigned int) sizeof(iris_info.image_name),
+                   iris_info.image_name);
+    if (count != sizeof(iris_info.image_name))
+      ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
       iris_info.image_name[sizeof(iris_info.image_name)-1]=0;
       iris_info.color_map=ReadBlobMSBLong(image);
-      (void) ReadBlob(image,(unsigned int) sizeof(iris_info.dummy2),
-		      iris_info.dummy2);
+    count=ReadBlob(image,(unsigned int) sizeof(iris_info.dummy2),
+                   iris_info.dummy2);
+    if (count != sizeof(iris_info.dummy2))
+      ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
 
       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 			    "    Header: Storage=%u, BPC=%u, Dimension=%u, "