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avcodec/diracdec: Count truncated parts as errors in decode_component()

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Fixes: Timeout (29sec -> 4sec)
Fixes: 13150/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5690185671507968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-03-08 15:43:08 +01:00
parent efe4aef90f
commit dd2a2a51fe
1 changed files with 4 additions and 1 deletions
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5
libavcodec/diracdec.c
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@ -685,7 +685,10 @@ static int decode_component(DiracContext *s, int comp)
}
align_get_bits(&s->gb);
b->coeff_data = s->gb.buffer + get_bits_count(&s->gb)/8;
b->length = FFMIN(b->length, FFMAX(get_bits_left(&s->gb)/8, 0));
if (b->length > FFMAX(get_bits_left(&s->gb)/8, 0)) {
b->length = FFMAX(get_bits_left(&s->gb)/8, 0);
damaged_count ++;
}
skip_bits_long(&s->gb, b->length*8);
}
}