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h264: fix overreads in cabac reader.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje
2012-03-16 21:56:40 -07:00
parent d360dd902c
commit 7374fac804
1 changed files with 4 additions and 2 deletions
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2
libavcodec/cabac_functions.h
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@ -47,6 +47,7 @@ static void refill(CABACContext *c){
c->low+= c->bytestream[0]<<1; c->low+= c->bytestream[0]<<1;
#endif #endif
c->low -= CABAC_MASK; c->low -= CABAC_MASK;
if (c->bytestream < c->bytestream_end)
c->bytestream += CABAC_BITS / 8; c->bytestream += CABAC_BITS / 8;
} }
@ -74,6 +75,7 @@ static void refill2(CABACContext *c){
#endif #endif
c->low += x<<i; c->low += x<<i;
if (c->bytestream < c->bytestream_end)
c->bytestream += CABAC_BITS/8; c->bytestream += CABAC_BITS/8;
} }