Fixes: Timeout
Fixes: 
48418/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MTS2_fuzzer-4834851466903552

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/mss4.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/mss4.c b/libavcodec/mss4.c
index 9f3c4a593d..43eb1025aa 100644
--- a/libavcodec/mss4.c
+++ b/libavcodec/mss4.c
@@ -26,6 +26,7 @@
  */
 
 #include "libavutil/thread.h"
+#include "libavutil/imgutils.h"
 
 #include "avcodec.h"
 #include "bytestream.h"
@@ -477,6 +478,9 @@ static int mss4_decode_frame(AVCodecContext *avctx, AVFrame 
*rframe,
                width, height);
         return AVERROR_INVALIDDATA;
     }
+    if (av_image_check_size2(width, height, avctx->max_pixels, 
AV_PIX_FMT_NONE, 0, avctx) < 0)
+        return AVERROR_INVALIDDATA;
+
     if (quality < 1 || quality > 100) {
         av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality);
         return AVERROR_INVALIDDATA;
-- 
2.17.1

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