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avformat/vividas: check length in read_vblock()

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Fixes: out of array access
Fixes: 15166/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5731062396747776

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 2019-06-12 14:49:11 +02:00
parent 07ffe94c17
commit d8716e3df9
1 changed files with 1 additions and 1 deletions
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2
libavformat/vividas.c
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@ -205,7 +205,7 @@ static uint8_t *read_vblock(AVIOContext *src, uint32_t *size,
decode_block(tmp, tmp, 4, key, k2, align);
n = get_v(tmp);
if (!n)
if (n < 4)
return NULL;
buf = av_malloc(n);