netdev - [PATCH v2] net/ncsi: Disable the ncsi work before freeing the associated structure

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Message-ID: <20240925155523.1017097-1-eajames@linux.ibm.com>
Date: Wed, 25 Sep 2024 10:55:23 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: sam@...dozajonas.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, gwshan@...ux.vnet.ibm.com, joel@....id.au,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH v2] net/ncsi: Disable the ncsi work before freeing the associated structure

The work function can run after the ncsi device is freed, resulting
in use-after-free bugs or kernel panic.

Fixes: 2d283bdd079c ("net/ncsi: Resource management")
Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
Changes since v1:
 - Use disable_work_sync instead of cancel_work_sync

 net/ncsi/ncsi-manage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 5ecf611c8820..5cf55bde366d 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1954,6 +1954,8 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
 	list_del_rcu(&ndp->node);
 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);
 
+	disable_work_sync(&ndp->work);
+
 	kfree(ndp);
 }
 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
-- 
2.43.0