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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-03-16 21:56:40 -0700 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-03-28 08:01:28 -0700 |
| commit | 7374fac80406d6c1a67a0e3265cfe6dfcc51ce61 (patch) | |
| tree | 59bfddefc944a8ef5942e591bea8ac0f2f352dcc | |
| parent | d360dd902c602aea2d634a0091cc7754eab4839e (diff) | |
| download | ffmpeg-7374fac80406d6c1a67a0e3265cfe6dfcc51ce61.tar.gz | |
h264: fix overreads in cabac reader.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
| -rw-r--r-- | libavcodec/cabac_functions.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/cabac_functions.h b/libavcodec/cabac_functions.h index b150aabcc4..4c74cf7b23 100644 --- a/libavcodec/cabac_functions.h +++ b/libavcodec/cabac_functions.h @@ -47,7 +47,8 @@ static void refill(CABACContext *c){ c->low+= c->bytestream[0]<<1; #endif c->low -= CABAC_MASK; - c->bytestream+= CABAC_BITS/8; + if (c->bytestream < c->bytestream_end) + c->bytestream += CABAC_BITS / 8; } static inline void renorm_cabac_decoder_once(CABACContext *c){ @@ -74,7 +75,8 @@ static void refill2(CABACContext *c){ #endif c->low += x<<i; - c->bytestream+= CABAC_BITS/8; + if (c->bytestream < c->bytestream_end) + c->bytestream += CABAC_BITS/8; } static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){ |