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avcodec/utvideodec: Check subsample factors 

Fixes: Out of array read
Fixes: heap_poc

Found-by: GwanYeong Kim <gy741.kim@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-26 03:02:48 +01:00
parent bbed942dfd
commit 7414d0bda7
1 changed files with 9 additions and 0 deletions
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9
libavcodec/utvideodec.c
View File

@ -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"
@ -912,6 +913,7 @@ 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;
@ -1012,6 +1014,13 @@ 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;
}
if (c->pack && avctx->extradata_size >= 16) {
av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
avctx->extradata[3], avctx->extradata[2],