diff options
| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-03-27 12:26:46 -0700 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-03-28 07:06:47 -0700 |
| commit | 0a82f5275f719e6e369a807720a2c3603aa0ddd9 (patch) | |
| tree | 8a1cf45648efac926d991465905e073601cde5ca /libavcodec/lagarithrac.c | |
| parent | c0b34e61483aa08524dd9c0383419d11d09b0181 (diff) | |
| download | ffmpeg-0a82f5275f719e6e369a807720a2c3603aa0ddd9.tar.gz | |
lagarith: fix buffer overreads.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Diffstat (limited to 'libavcodec/lagarithrac.c')
| -rw-r--r-- | libavcodec/lagarithrac.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/lagarithrac.c b/libavcodec/lagarithrac.c index 33dc6e4bd4..edfb18fb74 100644 --- a/libavcodec/lagarithrac.c +++ b/libavcodec/lagarithrac.c @@ -32,15 +32,16 @@ void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length) { - int i, j; + int i, j, left; /* According to reference decoder "1st byte is garbage", * however, it gets skipped by the call to align_get_bits() */ align_get_bits(gb); + left = get_bits_left(gb) >> 3; l->bytestream_start = l->bytestream = gb->buffer + get_bits_count(gb) / 8; - l->bytestream_end = l->bytestream_start + length; + l->bytestream_end = l->bytestream_start + FFMIN(length, left); l->range = 0x80; l->low = *l->bytestream >> 1; |