linux-kernel - [PATCH net 4/4] net: Avoid calling WARN_ON() on -ENOMEM in __dev_change_net

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Message-ID: <20250325141912.499929-1-i.abramov@mt-integration.ru>
Date: Tue, 25 Mar 2025 17:19:12 +0300
From: Ivan Abramov <i.abramov@...integration.ru>
To: "David S. Miller" <davem@...emloft.net>
CC: Ivan Abramov <i.abramov@...integration.ru>, Jakub Kicinski
	<kuba@...nel.org>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH net 4/4] net: Avoid calling WARN_ON() on -ENOMEM in __dev_change_net_namespace()

It's pointless to call WARN_ON() in case of an allocation failure in
device_rename(), since it only leads to useless splats caused by deliberate
fault injections, so avoid it.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Fixes: 8b41d1887db7 ("[NET]: Fix running without sysfs")
Signed-off-by: Ivan Abramov <i.abramov@...integration.ru>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 2f7f5fd9ffec..14726cc8796b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -12102,7 +12102,7 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net,
 	dev_set_uevent_suppress(&dev->dev, 1);
 	err = device_rename(&dev->dev, dev->name);
 	dev_set_uevent_suppress(&dev->dev, 0);
-	WARN_ON(err);
+	WARN_ON(err && err != -ENOMEM);
 
 	/* Send a netdev-add uevent to the new namespace */
 	kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
-- 
2.39.5