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Code Releases Activity

avcodec/siren: Check available bits in decode_envelope()

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Fixes: Timeout
Fixes: 39089/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSNSIREN_fuzzer-6677219854909440

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Suggested-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-28 00:25:20 +02:00
parent df163487d0
commit 109113b54f
1 changed files with 5 additions and 1 deletions
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6
libavcodec/siren.c
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@ -447,6 +447,8 @@ static int decode_envelope(SirenContext *s, GetBitContext *gb,
int index = 0;
do {
if (get_bits_left(gb) < 4)
return AVERROR_INVALIDDATA;
index = differential_decoder_tree[i - 1][index][get_bits1(gb)];
} while (index > 0);
@ -724,9 +726,11 @@ static int siren_decode(AVCodecContext *avctx, void *data,
skip_bits(gb, s->sample_rate_bits);
decode_envelope(s, gb, s->number_of_regions,
ret = decode_envelope(s, gb, s->number_of_regions,
s->decoder_standard_deviation,
s->absolute_region_power_index, s->esf_adjustment);
if (ret < 0)
return ret;
rate_control = get_bits(gb, 4);