SJOIN: Fix crash when both mode parameter and UID list are missing.

Closes #63

(cherry picked from commit b733b9faf444746ae93150e2b64120954610db68)

diff --git a/modules/core/m_join.c b/modules/core/m_join.c
index 339aaa3a740d7ece812446de63e4fd423fbcb582..8542f123e0d4d7beba2e6ef5ee9be71d8d26ea1a 100644 (file)
--- a/modules/core/m_join.c
+++ b/modules/core/m_join.c
@@ -537,6 +537,9 @@ ms_sjoin(struct Client *client_p, struct Client *source_p, int parc, const char
        static char empty[] = "";
        rb_dlink_node *ptr, *next_ptr;
 
+       if(parc < 5)
+               return 0;
+
        if(!IsChannelName(parv[2]) || !check_channel_name(parv[2]))
                return 0;