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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-10-13 04:06:54 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-10-15 01:45:24 +0300 |
| commit | 70d0cc8221618c715b9f6421f7185d56e59e0f40 (patch) | |
| tree | fe30be98c7d1a4ff2fac4f193e56947f08418949 | |
| parent | 1959c0f9f92104edcfd2c8648fabdfce01cef0f3 (diff) | |
avcodec/snowdec: Check mv_scale
Fixes: runtime error: signed integer overflow: 2 * -1094995530 cannot be represented in type 'int'
Fixes: 3512/clusterfuzz-testcase-minimized-4812747210489856
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 393d6fc7395611a38792e3c271b2be42ac45e672)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/snowdec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c index 0ac0b55012..6eff729a19 100644 --- a/libavcodec/snowdec.c +++ b/libavcodec/snowdec.c @@ -394,9 +394,10 @@ static int decode_header(SnowContext *s){ s->mv_scale += get_symbol(&s->c, s->header_state, 1); s->qbias += get_symbol(&s->c, s->header_state, 1); s->block_max_depth+= get_symbol(&s->c, s->header_state, 1); - if(s->block_max_depth > 1 || s->block_max_depth < 0){ + if(s->block_max_depth > 1 || s->block_max_depth < 0 || s->mv_scale > 256U){ av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth); s->block_max_depth= 0; + s->mv_scale = 0; return AVERROR_INVALIDDATA; } if (FFABS(s->qbias) > 127) { |