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avcodec/wmalosslessdec: Check remaining space before padding and channel residue

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Fixes: Timeout (1101sec -> 0.4sec)
Fixes: 24491/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5725337036783616

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 c467adf3bf9bb4b7fd28956ec698d884e63f145d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-13 21:12:17 +02:00
parent 31f9d1ec36
commit a119416654
1 changed files with 2 additions and 0 deletions
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2
libavcodec/wmalosslessdec.c
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@ -932,6 +932,8 @@ static int decode_subframe(WmallDecodeCtx *s)
s->do_lpc = 0; s->do_lpc = 0;
} }
if (get_bits_left(&s->gb) < 1)
return AVERROR_INVALIDDATA;
if (get_bits1(&s->gb)) if (get_bits1(&s->gb))
padding_zeroes = get_bits(&s->gb, 5); padding_zeroes = get_bits(&s->gb, 5);