commit 8706182376f193ca8a81a479f7ac559c3b0df688
author Yaowu Xu <yaowu@google.com> Fri May 20 07:55:08 2016 -0700
committer Yaowu Xu <yaowu@google.com> Fri Sep 09 12:43:02 2016 -0700
tree 9f44779d03aacff10d5d282efaec0f2f1cd0dbce
parent aa8729c55f077bbb9512415c620f62cf11b6c219

Convert to int before adding negative numbers

This is avoid that -1 overflows uint32_t.

cherry-picked #c48106da from aom/master

Change-Id: Ic3d99b1985cdb0a28cc83f8291422f5aba5a5a6d

av1/encoder/lookahead.c

diff --git a/av1/encoder/lookahead.c b/av1/encoder/lookahead.c
index d005438..f5a0aa5 100644
--- a/av1/encoder/lookahead.c
+++ b/av1/encoder/lookahead.c
@@ -213,8 +213,8 @@
   } else if (index < 0) {
     // Backward peek
     if (-index <= MAX_PRE_FRAMES) {
-      index += ctx->read_idx;
-      if (index < 0) index += ctx->max_sz;
+      index += (int)(ctx->read_idx);
+      if (index < 0) index += (int)(ctx->max_sz);
       buf = ctx->buf + index;
     }
   }