--- a/lib/dgif_lib.c	2016-04-02 23:34:00.000000000 +0800
+++ b/lib/dgif_lib_1.c	2019-07-17 11:42:30.488000000 +0800
@@ -288,7 +288,11 @@ DGifGetScreenDesc(GifFileType *GifFile)
     } else {
         GifFile->SColorMap = NULL;
     }
-
+    /*
+     * No check here for whether the background color is in range for the
+     * screen color map.  Possibly there should be.
+     */
+ 
     return GIF_OK;
 }
 
--- a/util/gif2rgb.c	2016-03-18 00:24:17.000000000 +0800
+++ b/util/gif2rgb_1.c	2019-07-17 11:45:22.044000000 +0800
@@ -15,7 +15,7 @@ Toshio Kuratomi had written this in a co
 
 I (ESR) took this off the main to-do list in 2012 because I don't think
 the GIFLIB project actually needs to be in the converters-and-tools business.
-Plenty of hackers do that; our jub is to supply stable library capability
+Plenty of hackers do that; our job is to supply stable library capability
 with our utilities mainly interesting as test tools.
 
 ***************************************************************************/
@@ -461,7 +461,7 @@ static void GIF2RGB(int NumFiles, char *
 		break;
 	}
     } while (RecordType != TERMINATE_RECORD_TYPE);
-
+    
     /* Lets dump it - set the global variables required and do it: */
     ColorMap = (GifFile->Image.ColorMap
 		? GifFile->Image.ColorMap
@@ -471,6 +471,12 @@ static void GIF2RGB(int NumFiles, char *
         exit(EXIT_FAILURE);
     }
 
+    /* check that the background color isn't garbage (SF bug #87) */
+    if (GifFile->SBackGroundColor < 0 || GifFile->SBackGroundColor >= ColorMap->ColorCount) {
+        fprintf(stderr, "Background color out of range for colormap\n");
+        exit(EXIT_FAILURE);
+    }
+
     DumpScreen2RGB(OutFileName, OneFileFlag,
 		   ColorMap,
 		   ScreenBuffer,