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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 22:50:45 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2014-12-20 10:51:41 +0100 |
| commit | 58dc526ebf722d33bf09275c1241674e0e6b9ef1 (patch) | |
| tree | 78f644f3fef8e33101591fd87fce7329dc23dc71 | |
| parent | eac49477aa95cf727d87d2741ee8e60be59d394b (diff) | |
| download | ffmpeg-58dc526ebf722d33bf09275c1241674e0e6b9ef1.tar.gz | |
smc: fix the bounds check
Fixes invalid writes when there are more blocks in a run than total
remaining blocks.
CC: libav-stable@libav.org
Bug-ID: CVE-2014-8548
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Anton Khirnov <anton@khirnov.net>
(cherry picked from commit d423dd72be451462c6fb1cbbe313bed0194001ab)
Signed-off-by: Anton Khirnov <anton@khirnov.net>
| -rw-r--r-- | libavcodec/smc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/smc.c b/libavcodec/smc.c index 46903ab2af..c6541da843 100644 --- a/libavcodec/smc.c +++ b/libavcodec/smc.c @@ -70,7 +70,7 @@ typedef struct SmcContext { row_ptr += stride * 4; \ } \ total_blocks--; \ - if (total_blocks < 0) \ + if (total_blocks < !!n_blocks) \ { \ av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \ return; \ |