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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-06-21 22:10:23 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-06-25 22:58:45 +0200 |
| commit | 84bbdc255a12cfe92c0a0c745245e3f85a23ae98 (patch) | |
| tree | 123225dfaadb72a0aafc614bdfb5f4e4ca658c86 | |
| parent | 6677c98626489edfdb4b49b4f66ca91867768a9f (diff) | |
avcodec/ffv1dec: Check state transition table
Fixes: Timeout
Fixes: 8646/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5649968353247232
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/ffv1dec.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c index 7658a51685..261e0cf70c 100644 --- a/libavcodec/ffv1dec.c +++ b/libavcodec/ffv1dec.c @@ -546,8 +546,14 @@ static int read_header(FFV1Context *f) f->ac = get_symbol(c, state, 0); if (f->ac == AC_RANGE_CUSTOM_TAB) { - for (i = 1; i < 256; i++) - f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i]; + for (i = 1; i < 256; i++) { + int st = get_symbol(c, state, 1) + c->one_state[i]; + if (st < 1 || st > 255) { + av_log(f->avctx, AV_LOG_ERROR, "invalid state transition %d\n", st); + return AVERROR_INVALIDDATA; + } + f->state_transition[i] = st; + } } colorspace = get_symbol(c, state, 0); //YUV cs type |