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| author | Michael Niedermayer <michaelni@gmx.at> | 2015-02-24 03:12:22 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-06-10 02:13:09 +0200 |
| commit | bc0bf39e4ccfb0a85ddb2b072d42bad2a8e8b1be (patch) | |
| tree | eb37ce0befe479bf18baa516cd96fa2a87ed4c42 | |
| parent | 3cca4c770ea6c9b946067df7b0f46716fc864414 (diff) | |
| download | ffmpeg-bc0bf39e4ccfb0a85ddb2b072d42bad2a8e8b1be.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>
(cherry picked from commit 8f4cbf940212079a34753c7f4d6c6b5a43586d30)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -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 c8a03277e6..f2ea8de491 100644 --- a/libavcodec/snowdec.c +++ b/libavcodec/snowdec.c @@ -156,7 +156,7 @@ 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)); |