conf/ile: use lxc_safe_uint() in config_monitor()

src/lxc/conf.h

@@ -350,7 +350,7 @@ struct lxc_conf {
 	int nbd_idx;
 
 	/* unshare the mount namespace in the monitor */
-	int monitor_unshare;
+	unsigned int monitor_unshare;
 
 	/* set to true when rootfs has been setup */
 	bool rootfs_setup;

src/lxc/confile.c

@@ -1171,7 +1171,8 @@ static int config_monitor(const char *key, const char *value,
 			  struct lxc_conf *lxc_conf)
 {
 	if(strcmp(key, "lxc.monitor.unshare") == 0) {
-		lxc_conf->monitor_unshare = atoi(value);
+		if (lxc_safe_uint(value, &lxc_conf->monitor_unshare) < 0)
+			return -1;
 		return 0;
 	}
 	SYSERROR("Unknown key: %s", key);