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| author | Michael Niedermayer <michaelni@gmx.at> | 2015-02-24 03:12:22 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-02-24 03:15:42 +0100 |
| commit | 8f4cbf940212079a34753c7f4d6c6b5a43586d30 (patch) | |
| tree | 7b4e0651bc1d97d1b8debf3f247ef76fdae6a58f /libavcodec | |
| parent | fb8e5044b420d4f7409a3bf2cc5498e8302882be (diff) | |
| download | ffmpeg-8f4cbf940212079a34753c7f4d6c6b5a43586d30.tar.gz | |
avcodec/snowdec: Fix ref value check
Fixes integer overflow and out of array read.
Fixes: signal_sigsegv_24169e6_3445_cov_3778346427_snow_chroma_bug.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/snowdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c index e37190d0f9..81fe03c9c1 100644 --- a/libavcodec/snowdec.c +++ b/libavcodec/snowdec.c @@ -174,7 +174,7 @@ static int decode_q_branch(SnowContext *s, int level, int x, int y){ int l = left->color[0]; int cb= left->color[1]; int cr= left->color[2]; - int ref = 0; + unsigned ref = 0; int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref); int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx)); int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my)); |