File GraphicsMagick-CVE-2017-12937.patch of Package GraphicsMagick.7782

--- a/coders/sun.c	Mon Jul 31 09:35:26 2017 -0400
+++ b/coders/sun.c	Mon Jul 31 21:49:45 2017 -0500
@@ -577,6 +577,7 @@
           for (bit=7; bit >= 0; bit--)
             {
               index=((*p) & (0x01 << bit) ? 0x01 : 0x00);
+              VerifyColormapIndex(image,index);
               indexes[x+7-bit]=index;
               q[x+7-bit]=image->colormap[index];
             }
@@ -587,6 +588,7 @@
             for (bit=7; bit >= (long) (8-(image->columns % 8)); bit--)
               {
                 index=((*p) & (0x01 << bit) ? 0x01 : 0x00);
+                VerifyColormapIndex(image,index);
                 indexes[x+7-bit]=index;
                 q[x+7-bit]=image->colormap[index];
               }