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avcodec/flashsv: check diff_start/height

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Fixes out of array accesses
Fixes Ticket2844

Found-by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-20 23:18:48 +02:00
parent 78d2a781d0
commit 880c73cd76
1 changed files with 4 additions and 0 deletions
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4
libavcodec/flashsv.c
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@ -387,6 +387,10 @@ static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
}
s->diff_start = get_bits(&gb, 8);
s->diff_height = get_bits(&gb, 8);
if (s->diff_start + s->diff_height > cur_blk_height) {
av_log(avctx, AV_LOG_ERROR, "Block parameters invalid\n");
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG,
"%dx%d diff start %d height %d\n",
i, j, s->diff_start, s->diff_height);