linux-kernel - [PATCH net 0/4] Avoid using WARN_ON() on allocation failure in device

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Message-ID: <20250325141723.499850-1-i.abramov@mt-integration.ru>
Date: Tue, 25 Mar 2025 17:17:19 +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 0/4] Avoid using WARN_ON() on allocation failure in device_rename()

This patch series is based on
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ and is
intended for the generic netdev maintainers, as it affects multiple
networking subsystems.

There are a couple of Syzkaller reports about WARN_ON() being triggered
by failed device_rename().

They are triggered by fuzzer's fault injection and subsequent allocation
failure in kstrdup(). Failure of kstrdup() in device_rename() should not
lead to WARN_ON(), so means to avoid it are introduced in this series.

If it is possible to reverse the changes done prior to failed
device_rename(), do that. Otherwise ignore -ENOMEM return code in
WARN_ON().

Ivan Abramov (4):
  ieee802154: Restore initial state on failed device_rename() in
    cfg802154_switch_netns()
  ieee802154: Avoid calling WARN_ON() on -ENOMEM in
    cfg802154_pernet_exit()
  cfg80211: Avoid calling WARN_ON() on -ENOMEM in
    cfg80211_switch_netns()
  net: Avoid calling WARN_ON() on -ENOMEM in
    __dev_change_net_namespace()

 net/core/dev.c        |  2 +-
 net/ieee802154/core.c | 51 ++++++++++++++++++++++++-------------------
 net/wireless/core.c   |  2 +-
 3 files changed, 31 insertions(+), 24 deletions(-)

-- 
2.39.5