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aasc: check before reading the first 4 byte, fix overread 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-11-14 03:03:04 +01:00
parent 39c5cd601e
commit e1631f8ebe
1 changed files with 5 additions and 0 deletions
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5
libavcodec/aasc.c
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@ -83,6 +83,11 @@ static int aasc_decode_frame(AVCodecContext *avctx,
AascContext *s = avctx->priv_data;
int compr, i, stride, psize;
if (buf_size < 4) {
av_log(avctx, AV_LOG_ERROR, "frame too short\n");
return AVERROR_INVALIDDATA;
}
s->frame.reference = 3;
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->reget_buffer(avctx, &s->frame)) {