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avcodec/ffv1dec: Check that num h/v slices is supported 

Fixes: out of array access
Fixes: 55597/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-4898293416329216

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 8ead0ae68e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-02-18 22:33:02 +01:00
parent 26a98f0dba
commit 747cefb8e6
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1 changed files with 5 additions and 0 deletions
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libavcodec/ffv1dec.c
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@ -478,6 +478,11 @@ static int read_extra_header(FFV1Context *f)
return AVERROR_INVALIDDATA;
}
if (f->num_h_slices > MAX_SLICES / f->num_v_slices) {
av_log(f->avctx, AV_LOG_ERROR, "slice count unsupported\n");
return AVERROR_PATCHWELCOME;
}
f->quant_table_count = get_symbol(c, state, 0);
if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count) {
av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);