From 45dfe2ba3889c5dc23a9bea3214f158cc651a043 Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Thu, 19 Oct 2017 11:17:56 +0200
Subject: [PATCH] Prevent a OOB read when parsing IRCNet ! channels

Make sure the string has enough data.
Fixes #16
---
 src/irc/core/channel-events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/irc/core/channel-events.c b/src/irc/core/channel-events.c
index 6cb9b088..b0bddab2 100644
--- a/src/irc/core/channel-events.c
+++ b/src/irc/core/channel-events.c
@@ -37,7 +37,7 @@ static void check_join_failure(IRC_SERVER_REC *server, const char *channel)
 		channel++; /* server didn't understand !channels */
 
 	chanrec = channel_find(SERVER(server), channel);
-	if (chanrec == NULL && channel[0] == '!') {
+	if (chanrec == NULL && channel[0] == '!' && strlen(channel) > 6) {
 		/* it probably replied with the full !channel name,
 		   find the channel with the short name.. */
 		chan2 = g_strdup_printf("!%s", channel+6);