ICB has been designed for a user always need to be joined to a group.
With the irssi-icb module you can break this rule currently by running
the '/window close' command and therefore crash irssi simply:
/window close
/j 2
Segmentation fault (core dumped)
icb-channels.c:icb_change_channel() will try to compare the current
group with the new group on the next join command, and in case of a
previous '/window close' irssi has already destroyed our group and
freed the reference to it. Hence icb_change_channel() is comparing
a group string against a freed memory address and segfaults.
Attached patch disables the '/window close' command for ICB
connections, since this just shouldn't be supported.
Index: net/irssi-icb/Makefile
===================================================================
RCS file: /cvs/ports/net/irssi-icb/Makefile,v
retrieving revision 1.39
diff -u -p -u -p -r1.39 Makefile
--- net/irssi-icb/Makefile 16 Mar 2016 21:19:38 -0000 1.39
+++ net/irssi-icb/Makefile 5 Jun 2016 05:54:40 -0000
@@ -7,6 +7,7 @@ GH_PROJECT= irssi-icb
GH_COMMIT= 8f7060835355d5f620a5d3b75a45336ab8efefd9
DISTNAME= irssi-icb-0.16pre20160307
+REVISION= 0
CATEGORIES= net
Index: net/irssi-icb/patches/patch-src_core_icb-commands_c
===================================================================
RCS file: net/irssi-icb/patches/patch-src_core_icb-commands_c
diff -N net/irssi-icb/patches/patch-src_core_icb-commands_c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ net/irssi-icb/patches/patch-src_core_icb-commands_c 5 Jun 2016 05:54:40
-0000
@@ -0,0 +1,29 @@
+--- src/core/icb-commands.c.orig Mon Mar 7 09:54:15 2016
++++ src/core/icb-commands.c Sun Jun 5 04:36:09 2016
+@@ -101,6 +101,18 @@
+ }
+ }
+
++static void cmd_window(const char *data, ICB_SERVER_REC *server)
++{
++ CMD_ICB_SERVER(server);
++
++ /*
++ * Disable the '/window close' command because in ICB you should
++ * always be joined to a group. Otherwise nasty things can happen.
++ */
++ if (*data != '\0' && (*data == 'c' || *data == 'C'))
++ signal_stop();
++}
++
+ void icb_commands_init(void)
+ {
+ char **cmd;
+@@ -116,6 +128,7 @@
+ command_bind_icb("kick", NULL, (SIGNAL_FUNC) cmd_boot);
+ command_bind_icb("g", NULL, (SIGNAL_FUNC) cmd_group);
+ command_bind_icb("beep", NULL, (SIGNAL_FUNC) cmd_beep);
++ command_bind_icb("window", NULL, (SIGNAL_FUNC) cmd_window);
+
+ command_set_options("connect", "+icbnet");
+ }
