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avcodec/ilbcdec: Check startindex

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Fixes: Out of array read
Fixes: 10789/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ILBC_fuzzer-5153255445757952

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 2018-10-21 00:35:12 +02:00
parent da6db843b8
commit e90f0ac334
1 changed files with 1 additions and 1 deletions
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libavcodec/ilbcdec.c
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@ -1372,7 +1372,7 @@ static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
if (unpack_frame(s))
mode = 0;
if (s->frame.start < 1)
if (s->frame.start < 1 || s->frame.start > 5)
mode = 0;
if (mode) {