I doubt that anyone ever would try to send a 1 byte packet
via the RTP protocol, but check just in case - it shouldn't
crash at least.
---
 libavformat/rtpproto.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/rtpproto.c b/libavformat/rtpproto.c
index b4475ae..974aa35 100644
--- a/libavformat/rtpproto.c
+++ b/libavformat/rtpproto.c
@@ -377,6 +377,9 @@ 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;
-- 
1.7.9.4

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