--- a/lib/dgif_lib.c	2019-10-15 07:16:42.457000000 -0400
+++ b/lib/dgif_lib-1.c	2019-10-15 07:18:08.173000000 -0400
@@ -1103,7 +1103,7 @@ DGifSlurp(GifFileType *GifFile)
 
               sp = &GifFile->SavedImages[GifFile->ImageCount - 1];
               /* Allocate memory for the image */
-              if (sp->ImageDesc.Width < 0 && sp->ImageDesc.Height < 0 &&
+              if (sp->ImageDesc.Width <= 0 && sp->ImageDesc.Height <= 0 &&
                       sp->ImageDesc.Width > (INT_MAX / sp->ImageDesc.Height)) {
                   return GIF_ERROR;
               }