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avcodec/shorten: Check verbatim length 

Fixes: Timeout
Fixes: 9252/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5780720709533696

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 7007dabec0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-12 22:43:33 +02:00
parent c0a6febf32
commit 2c3ea34082
1 changed files with 5 additions and 0 deletions
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5
libavcodec/shorten.c
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@ -623,6 +623,11 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
switch (cmd) {
case FN_VERBATIM:
len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
if (len < 0 || len > get_bits_left(&s->gb)) {
av_log(avctx, AV_LOG_ERROR, "verbatim length %d invalid\n",
len);
return AVERROR_INVALIDDATA;
}
while (len--)
get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
break;