From 62c5949beca2c95d6af5c74985467438d2295a66 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 9 May 2017 19:38:46 +0200
Subject: [PATCH] avcodec/cllc: Check prefix

Fixes: runtime error: left shift of 1610706944 by 1 places cannot be represented in type 'int'
Fixes: 1421/clusterfuzz-testcase-minimized-6239947507892224

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/cllc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
index e0895d2e1f..77de6e71c7 100644
--- a/libavcodec/cllc.c
+++ b/libavcodec/cllc.c
@@ -71,6 +71,10 @@ static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
 
             count++;
         }
+        if (prefix > (65535 - 256)/2) {
+            vlc->table = NULL;
+            return AVERROR_INVALIDDATA;
+        }
 
         prefix <<= 1;
     }
-- 
2.11.0