Merge commit '710b0e27025948b7511821c2f888ff2d74a59e14'

* commit '710b0e27025948b7511821c2f888ff2d74a59e14':
  smacker: Avoid integer overflow when allocating packets

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/smacker.c

@@ -331,7 +331,7 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
             }
             flags >>= 1;
         }
-        if (frame_size < 0)
+        if (frame_size < 0 || frame_size >= INT_MAX/2)
             return AVERROR_INVALIDDATA;
         if (av_new_packet(pkt, frame_size + 769))
             return AVERROR(ENOMEM);