commit ccfcc643da9e9f1dbf957731d2d4fc1f3150a98f
author Nick Terrell <terrelln@fb.com> Mon Oct 17 11:28:02 2016 -0700
committer Nick Terrell <terrelln@fb.com> Mon Oct 17 11:46:03 2016 -0700
tree c0565c80b3f2aece4a0698ab587f4c9977c0e97b
parent 2b361cf2f1b5b461e93357eb4a1cafed6e2bcfeb

Check if dict is empty before reading first byte

lib/common/entropy_common.c

diff --git a/lib/common/entropy_common.c b/lib/common/entropy_common.c
index acd9669..6625a80 100644
--- a/lib/common/entropy_common.c
+++ b/lib/common/entropy_common.c
@@ -168,9 +168,11 @@
 {
     U32 weightTotal;
     const BYTE* ip = (const BYTE*) src;
-    size_t iSize = ip[0];
+    size_t iSize;
     size_t oSize;
 
+    if (!srcSize) return ERROR(srcSize_wrong);
+    iSize = ip[0];
     /* memset(huffWeight, 0, hwSize);   *//* is not necessary, even though some analyzer complain ... */
 
     if (iSize >= 128) {  /* special header */