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avcodec/faxcompr: Check if bits are available before reading in cmode == 9 || cmode == 10

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

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 2021-06-09 21:20:04 +02:00
parent ffe4851e23
commit 7d8421e3d5
1 changed files with 4 additions and 1 deletions
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5
libavcodec/faxcompr.c
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@ -304,7 +304,10 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
mode = !mode;
}
} else if (cmode == 9 || cmode == 10) {
int xxx = get_bits(gb, 3);
int xxx;
if (get_bits_left(gb) < 3)
return AVERROR_INVALIDDATA;
xxx = get_bits(gb, 3);
if (cmode == 9 && xxx == 7) {
int ret;
int pix_left = width - offs;