From 7414d0bda7763f9bd69c26c068e482ab297c1c96 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 26 Feb 2018 03:02:48 +0100
Subject: [PATCH] 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>
---
 libavcodec/utvideodec.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c
index c5f5534964..086129d094 100644
--- a/libavcodec/utvideodec.c
+++ b/libavcodec/utvideodec.c
@@ -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],