Fix several potential overflow issues identified by the community.

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1114 632fc199-4ca6-4c93-a231-07263d6284db
2014-02-06 19:31:50 +00:00
parent 88dee5863a
commit d4ab63d191
3 changed files with 7 additions and 3 deletions
--- 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);