From e4d5f9bf93b58b30c2e91d26b40bc460457d88ee Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 6 Mar 2017 21:52:36 +0100
Subject: [PATCH] avcodec/wavpack: Fix runtime error: left shift of negative
 value -5

Fixes: 729/clusterfuzz-testcase-5154831595470848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3016e919d4e1d90da98af19ce2a9d4979506eaf3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/wavpack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 40601d9036..046abe272c 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -267,7 +267,7 @@ static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,
     int bit;
 
     if (s->extra_bits) {
-        S <<= s->extra_bits;
+        S *= 1 << s->extra_bits;
 
         if (s->got_extra_bits &&
             get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {