Fix several potential overflow issues identified by the community.

git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1112 632fc199-4ca6-4c93-a231-07263d6284db

1 files changed, 2 insertions, 0 deletions

diff --git a/jquant2.c b/jquant2.c
index 9b060e5..d994470 100644
--- a/jquant2.c
+++ b/jquant2.c
@@ -513,6 +513,8 @@ compute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor)
       }
     }
   
+  if (total == 0)
+    return;
   cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total>>1)) / total);
   cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total>>1)) / total);
   cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total>>1)) / total);