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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-28 20:12:25 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 13:33:44 +0200 |
| commit | 134d579dfcf108465425da75e89ee0f62aaf09be (patch) | |
| tree | 683d671ae9481741f6349720073c507b3a075553 | |
| parent | 73c20eb18e99f3061e644d2426528ffa7be07075 (diff) | |
| download | ffmpeg-134d579dfcf108465425da75e89ee0f62aaf09be.tar.gz | |
avcodec/lagarith: Sanity check scale
A value of 24 and above can collaps the range to 0 which would not work.
Fixes: Timeout (75sec -> 21sec)
Fixes: 18707/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LAGARITH_fuzzer-5708950892969984
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 fb3855342b9e4c577c63b38a7a5a574830a21934)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/lagarith.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c index 0f4aa89486..ff3eded761 100644 --- a/libavcodec/lagarith.c +++ b/libavcodec/lagarith.c @@ -222,6 +222,9 @@ static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb) } } + if (scale_factor > 23) + return AVERROR_INVALIDDATA; + rac->scale = scale_factor; /* Fill probability array with cumulative probability for each symbol. */ |