mirror of https://git.ffmpeg.org/ffmpeg.git
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>
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@ -546,8 +546,14 @@ static int read_header(FFV1Context *f)
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f->ac = get_symbol(c, state, 0);
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if (f->ac == AC_RANGE_CUSTOM_TAB) {
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for (i = 1; i < 256; i++)
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f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
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for (i = 1; i < 256; i++) {
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int st = get_symbol(c, state, 1) + c->one_state[i];
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if (st < 1 || st > 255) {
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av_log(f->avctx, AV_LOG_ERROR, "invalid state transition %d\n", st);
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return AVERROR_INVALIDDATA;
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}
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f->state_transition[i] = st;
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}
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}
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colorspace = get_symbol(c, state, 0); //YUV cs type
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