From e7fd68c29e712785519742991c5085e0a247b019 Mon Sep 17 00:00:00 2001
From: scumjr <scumjr@users.noreply.github.com>
Date: Thu, 19 May 2016 12:50:04 +0200
Subject: [PATCH] irc: fix NULL pointer dereference in 734 command callback

---
 src/plugins/irc/irc-protocol.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/plugins/irc/irc-protocol.c b/src/plugins/irc/irc-protocol.c
index b6a9cae24..91280103b 100644
--- a/src/plugins/irc/irc-protocol.c
+++ b/src/plugins/irc/irc-protocol.c
@@ -5384,8 +5384,13 @@ IRC_PROTOCOL_CALLBACK(733)
 
 IRC_PROTOCOL_CALLBACK(734)
 {
+    char *pos_args;
+
     IRC_PROTOCOL_MIN_ARGS(5);
 
+    pos_args = (argc > 5) ?
+        ((argv_eol[5][0] == ':') ? argv_eol[5] + 1 : argv_eol[5]) : NULL;
+
     weechat_printf_date_tags (
         irc_msgbuffer_get_target_buffer (
             server, NULL, command, "monitor", NULL),
@@ -5393,7 +5398,7 @@ IRC_PROTOCOL_CALLBACK(734)
         irc_protocol_tags (command, "irc_numeric", NULL, NULL),
         "%s%s (%s)",
         weechat_prefix ("error"),
-        (argv_eol[5][0] == ':') ? argv_eol[5] + 1 : argv_eol[5],
+        (pos_args && pos_args[0]) ? pos_args : "",
         argv[3]);
 
     return WEECHAT_RC_OK;