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avcodec/lscrdec: Check length in decode_idat() 

Fixes: out of array access
Fixes: 32264/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LSCR_fuzzer-6684504010915840

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 2021-03-30 13:17:09 +02:00
parent 6055b93379
commit c01cd2a8b2
1 changed files with 4 additions and 0 deletions
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4
libavcodec/lscrdec.c
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@ -76,6 +76,10 @@ static int decode_idat(LSCRContext *s, int length)
int ret;
s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
s->zstream.next_in = s->gb.buffer;
if (length <= 0)
return AVERROR_INVALIDDATA;
bytestream2_skip(&s->gb, length);
/* decode one line if possible */