From 7a032cb97f743a651138d2da6214c79e0ce089dd Mon Sep 17 00:00:00 2001
From: Andrey Utkin <andrey.krieger.utkin@gmail.com>
Date: Thu, 3 Nov 2011 07:00:15 +0000
Subject: [PATCH] Fix segfault on UDP reading

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/udp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/udp.c b/libavformat/udp.c
index 151e070d19..59d1f74d77 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -546,15 +546,19 @@ static int udp_read(URLContext *h, uint8_t *buf, int size)
             avail = av_fifo_size(s->fifo);
             if (avail) { // >=size) {
                 uint8_t tmp[4];
+                int skip = 0;
 
                 av_fifo_generic_read(s->fifo, tmp, 4, NULL);
                 avail= AV_RL32(tmp);
                 if(avail > size){
                     av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
+                    skip = avail - size;
                     avail= size;
                 }
 
                 av_fifo_generic_read(s->fifo, buf, avail, NULL);
+                if (skip)
+                    av_fifo_drain(s->fifo, skip);
                 return avail;
             }
             else {