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avcodec/cabac_functions: Fix "left shift of negative value -31767"

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Fixes: 1430e9c43fae47a24c179c7c54f94918/signal_sigsegv_421427_2340_591e9810c7b09efe501ad84638c9e9f8.264

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Found-by: xiedingbao (Ticket4727)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a1f6b05f52)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-27 12:11:29 +01:00
parent 54e94522b8
commit 1258bdf7f0
1 changed files with 2 additions and 1 deletions
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3
libavcodec/cabac_functions.h
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@ -74,7 +74,8 @@ static inline void renorm_cabac_decoder_once(CABACContext *c){
#ifndef get_cabac_inline
static void refill2(CABACContext *c){
int i, x;
int i;
unsigned x;
x= c->low ^ (c->low-1);
i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)];