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avcodec/g729_parser: Check block_size

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Fixes: Infinite loop
Fixes: 17611/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ACELP_KELVIN_fuzzer-5765134928052224

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>
(cherry picked from commit 972a0a818ff7a9b33c7f37e08783f4b6082f9aa2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-25 01:07:34 +02:00
parent b5d6694cb7
commit ea8d459fc9
1 changed files with 6 additions and 0 deletions
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6
libavcodec/g729_parser.c
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@ -51,6 +51,12 @@ static int g729_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
s->duration = avctx->frame_size;
}
if (!s->block_size) {
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
if (!s->remaining)
s->remaining = s->block_size;
if (s->remaining <= buf_size) {