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Code Issues Releases Activity

avcodec/utvideodec: Check subsample factors

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Fixes: Out of array read
Fixes: heap_poc

Found-by: GwanYeong Kim <gy741.kim@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7414d0bda7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-26 03:02:48 +01:00
parent 30a718c38b
commit ae49cc73f2
1 changed files with 9 additions and 0 deletions
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9
libavcodec/utvideodec.c
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@ -30,6 +30,7 @@
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/intreadwrite.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
@ -789,6 +790,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
static av_cold int decode_init(AVCodecContext *avctx)
{
UtvideoContext * const c = avctx->priv_data;
int h_shift, v_shift;
c->avctx = avctx;
@ -886,6 +888,13 @@ static av_cold int decode_init(AVCodecContext *avctx)
return AVERROR_INVALIDDATA;
}
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &h_shift, &v_shift);
if ((avctx->width & ((1<<h_shift)-1)) ||
(avctx->height & ((1<<v_shift)-1))) {
avpriv_request_sample(avctx, "Odd dimensions");
return AVERROR_PATCHWELCOME;
}
return 0;
}