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avcodec/mjpegdec: Check that reference frame matches the current frame 

Fixes: out of array read
Fixes: 2097/clusterfuzz-testcase-minimized-5036861833609216

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 2017-06-05 22:23:15 +02:00
parent d7cbeab4c1
commit 4705edbbb9
1 changed files with 9 additions and 0 deletions
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9
libavcodec/mjpegdec.c
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@ -1501,6 +1501,15 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
return -1;
}
if (reference) {
if (reference->width != s->picture_ptr->width ||
reference->height != s->picture_ptr->height ||
reference->format != s->picture_ptr->format) {
av_log(s->avctx, AV_LOG_ERROR, "Reference mismatching\n");
return AVERROR_INVALIDDATA;
}
}
av_assert0(s->picture_ptr->data[0]);
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);