Merge commit '1851e1d0'

* commit '1851e1d0':
  rtpproto: Check the size before reading buf[1]

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

libavformat/rtpproto.c

@@ -369,6 +369,9 @@ static int rtp_write(URLContext *h, const uint8_t *buf, int size)
     int ret;
     URLContext *hd;
 
+    if (size < 2)
+        return AVERROR(EINVAL);
+
     if (RTP_PT_IS_RTCP(buf[1])) {
         /* RTCP payload type */
         hd = s->rtcp_hd;