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avcodec/faxcompr: Check available bits in decode_uncompressed()

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Fixes: Timeout
Fixes: 34950/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5686764151898112
Fixes: 34966/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4587409334468608

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 ff56c139e0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-06-09 21:25:58 +02:00
parent d91f3644ce
commit 29d3e924a6
1 changed files with 2 additions and 0 deletions
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2
libavcodec/faxcompr.c
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@ -144,6 +144,8 @@ static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb,
return AVERROR_INVALIDDATA;
}
cwi = 10 - av_log2(cwi);
if (get_bits_left(gb) < cwi + 1)
return AVERROR_INVALIDDATA;
skip_bits(gb, cwi + 1);
if (cwi > 5) {
newmode = get_bits1(gb);