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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-08-06 21:35:06 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-11 21:23:48 +0200 |
| commit | 4155510f7486d24c21c5d78cba331fee9b2687a4 (patch) | |
| tree | 37bd2b9d1abf2178e700c479c7eda88b7a2f6903 | |
| parent | 475cfa1218e6d161422c3d53a6a229f69e562e9e (diff) | |
| download | ffmpeg-4155510f7486d24c21c5d78cba331fee9b2687a4.tar.gz | |
avcodec/snowdec: Sanity check hcoeff
Fixes: signed integer overflow: -2147483648 * -1 cannot be represented in type 'int'
Fixes: 24011/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-5486376610168832
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 d51d569cf68f78aaea8464a156c847a0e294726a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/snowdec.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c index 504382f589..dfbb9686da 100644 --- a/libavcodec/snowdec.c +++ b/libavcodec/snowdec.c @@ -369,7 +369,10 @@ static int decode_header(SnowContext *s){ htaps = htaps*2 + 2; p->htaps= htaps; for(i= htaps/2; i; i--){ - p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1)); + unsigned hcoeff = get_symbol(&s->c, s->header_state, 0); + if (hcoeff > 127) + return AVERROR_INVALIDDATA; + p->hcoeff[i]= hcoeff * (1-2*(i&1)); sum += p->hcoeff[i]; } p->hcoeff[0]= 32-sum; |