From 4899c02c385f8ab4b2be14b2e7fa5d6bfdcfa2a1 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 29 Feb 2016 19:04:54 +0100
Subject: [PATCH] avformat/protocols: Fix ff_urlcontext_child_class_next()

This fixes -read_ahead_limit

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/protocols.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/protocols.c b/libavformat/protocols.c
index f37497056d..77cd3a4a5c 100644
--- a/libavformat/protocols.c
+++ b/libavformat/protocols.c
@@ -215,7 +215,7 @@ const AVClass *ff_urlcontext_child_class_next(const AVClass *prev)
     int i;
 
     /* find the protocol that corresponds to prev */
-    for (i = 0; url_protocols[i]; i++) {
+    for (i = 0; prev && url_protocols[i]; i++) {
         if (url_protocols[i]->priv_data_class == prev) {
             i++;
             break;