From: Sven Eckelmann <sven@narfation.org>
Date: Sat, 19 Feb 2022 08:51:28 +0100
Subject: alfred: Ensure processed change_iface packet is 0-terminated

A client sending a alfred_change_interface_v0 packet to the alfred server
might have forgotten to 0-terminate the string. In this case, strstr in
unix_sock_change_iface might read outside of the available buffer.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Origin: upstream, https://git.open-mesh.org/alfred.git/commit/d2d27e4b9d697928d21dfa5c79908618ef8b56ac

--- a/unix_sock.c
+++ b/unix_sock.c
@@ -329,6 +329,8 @@ unix_sock_change_iface(struct globals *g
 	if (len < (int)(sizeof(*change_iface) - sizeof(change_iface->header)))
 		goto err;
 
+	change_iface->ifaces[sizeof(change_iface->ifaces) - 1] = '\0';
+
 	if (globals->opmode == OPMODE_SECONDARY) {
 		if (strstr(change_iface->ifaces, ",") != NULL) {
 			ret = -EINVAL;