batman-adv: Avoid WARN on net_device without parent in netns

commit 955d3411a17f590364238bd0d3329b61f20c1cd2 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index fbda6b54baffccf798375cb8add49bb179738386..51f060df64ef65aa7cc5cd2d51f079bd4462ff53 100644 (file)
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -89,8 +89,10 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
        /* recurse over the parent device */
        parent_dev = __dev_get_by_index(&init_net, net_dev->iflink);
        /* 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;
+       }
 
        ret = batadv_is_on_batman_iface(parent_dev);