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

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Message-ID: <20240917191255.1436553-1-eajames@linux.ibm.com>
Date: Tue, 17 Sep 2024 14:12:55 -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,
        eajames@...ux.ibm.com
Subject: [PATCH] net/ncsi: Cancel 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>
---
 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..3eda24eac668 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);
 
+	cancel_work_sync(&ndp->work);
+
 	kfree(ndp);
 }
 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
-- 
2.43.0