From 955d3411a17f590364238bd0d3329b61f20c1cd2 Mon Sep 17 00:00:00 2001
From: Sven Eckelmann <sven@narfation.org>
Date: Sun, 30 Dec 2018 12:46:01 +0100
Subject: [PATCH] batman-adv: Avoid WARN on net_device without parent in netns
Git-commit: 955d3411a17f590364238bd0d3329b61f20c1cd2
Patch-mainline: v5.0-rc6
References: bsc#1051510

It is not allowed to use WARN* helpers on potential incorrect input from
the user or transient problems because systems configured as panic_on_warn
will reboot due to such a problem.

A NULL return value of __dev_get_by_index can be caused by various problems
which can either be related to the system configuration or problems
(incorrectly returned network namespaces) in other (virtual) net_device
drivers. batman-adv should not cause a (harmful) WARN in this situation and
instead only report it via a simple message.

Fixes: b7eddd0b3950 ("batman-adv: prevent using any virtual device created on batman-adv as hard-interface")
Reported-by: syzbot+c764de0fcfadca9a8595@syzkaller.appspotmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/batman-adv/hard-interface.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -19,7 +19,6 @@
 #include "main.h"
 
 #include <linux/atomic.h>
-#include <linux/bug.h>
 #include <linux/byteorder/generic.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
@@ -172,8 +171,10 @@ static bool batadv_is_on_batman_iface(co
 	parent_dev = __dev_get_by_index((struct net *)parent_net,
 					dev_get_iflink(net_dev));
 	/* if we got a NULL parent_dev there is something broken.. */
-	if (WARN(!parent_dev, "Cannot find parent device"))
+	if (!parent_dev) {
+		pr_err("Cannot find parent device\n");
 		return false;
+	}
 
 	if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
 		return false;