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Code Issues Releases Activity

avcodec/shorten: Fix bitstream end check in read_header()

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Fixes: Timeout
Fixes: 9961/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5687856176562176

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-09-15 02:08:20 +02:00
parent 71bf033050
commit 28b80c2d52
1 changed files with 1 additions and 1 deletions
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2
libavcodec/shorten.c
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@ -456,7 +456,7 @@ static int read_header(ShortenContext *s)
} }
skip_bytes = get_uint(s, NSKIPSIZE); skip_bytes = get_uint(s, NSKIPSIZE);
if ((unsigned)skip_bytes > get_bits_left(&s->gb)/8) { if ((unsigned)skip_bytes > FFMAX(get_bits_left(&s->gb), 0)/8) {
av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes); av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes);
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }