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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , , , , Subject: [PATCH 1/3] ieee802154: Restore initial state on failed device_rename() in cfg802154_switch_netns() Date: Fri, 28 Mar 2025 04:04:25 +0300 Message-ID: <20250328010427.735657-2-i.abramov@mt-integration.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250328010427.735657-1-i.abramov@mt-integration.ru> References: <20250328010427.735657-1-i.abramov@mt-integration.ru> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: mmail-p-exch02.mt.ru (81.200.124.62) To mmail-p-exch01.mt.ru (81.200.124.61) X-KSMG-AntiPhishing: NotDetected X-KSMG-AntiSpam-Auth: dmarc=none header.from=mt-integration.ru;spf=none smtp.mailfrom=mt-integration.ru;dkim=none X-KSMG-AntiSpam-Envelope-From: i.abramov@mt-integration.ru X-KSMG-AntiSpam-Info: LuaCore: 51 0.3.51 68896fb0083a027476849bf400a331a2d5d94398, {rep_avail}, {Tracking_from_domain_doesnt_match_to}, 81.200.124.61:7.1.2;ksmg01.maxima.ru:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;mt-integration.ru:7.1.1;127.0.0.199:7.1.2, FromAlignment: s, ApMailHostAddress: 81.200.124.61 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiSpam-Lua-Profiles: 192175 [Mar 27 2025] X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Version: 6.1.1.11 X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.1.1.8310, bases: 2025/03/27 22:37:00 #27871126 X-KSMG-AntiVirus-Status: NotDetected, skipped X-KSMG-LinksScanning: NotDetected X-KSMG-Message-Action: skipped X-KSMG-Rule-ID: 7 X-Patchwork-Delegate: kuba@kernel.org Currently, the return value of device_rename() is not acted upon. To avoid an inconsistent state in case of failure, roll back the changes made before the device_rename() call. Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: 66e5c2672cd1 ("ieee802154: add netns support") Signed-off-by: Ivan Abramov --- net/ieee802154/core.c | 45 ++++++++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 20 deletions(-) diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c index 88adb04e4072..ddde594513a0 100644 --- a/net/ieee802154/core.c +++ b/net/ieee802154/core.c @@ -233,31 +233,36 @@ int cfg802154_switch_netns(struct cfg802154_registered_device *rdev, wpan_dev->netdev->netns_local = true; } - if (err) { - /* failed -- clean up to old netns */ - net = wpan_phy_net(&rdev->wpan_phy); - - list_for_each_entry_continue_reverse(wpan_dev, - &rdev->wpan_dev_list, - list) { - if (!wpan_dev->netdev) - continue; - wpan_dev->netdev->netns_local = false; - err = dev_change_net_namespace(wpan_dev->netdev, net, - "wpan%d"); - WARN_ON(err); - wpan_dev->netdev->netns_local = true; - } - - return err; - } - - wpan_phy_net_set(&rdev->wpan_phy, net); + if (err) + goto errout; err = device_rename(&rdev->wpan_phy.dev, dev_name(&rdev->wpan_phy.dev)); WARN_ON(err); + if (err) + goto errout; + + wpan_phy_net_set(&rdev->wpan_phy, net); + return 0; + +errout: + /* failed -- clean up to old netns */ + net = wpan_phy_net(&rdev->wpan_phy); + + list_for_each_entry_continue_reverse(wpan_dev, + &rdev->wpan_dev_list, + list) { + if (!wpan_dev->netdev) + continue; + wpan_dev->netdev->netns_local = false; + err = dev_change_net_namespace(wpan_dev->netdev, net, + "wpan%d"); + WARN_ON(err); + wpan_dev->netdev->netns_local = true; + } + + return err; } void cfg802154_dev_free(struct cfg802154_registered_device *rdev)