linux-kernel - [net PATCH v2] net: ravb: Fix possible UAF bug in ravb

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Date:   Sun, 12 Mar 2023 01:33:37 +0800
From:   Zheng Wang <zyytlz.wz@....com>
To:     s.shtylyov@....ru
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, hackerzheng666@...il.com,
        1395428693sheep@...il.com, alex000young@...il.com,
        Zheng Wang <zyytlz.wz@....com>
Subject: [net PATCH v2] net: ravb: Fix possible UAF bug in ravb_remove

In ravb_probe, priv->work was bound with ravb_tx_timeout_work.
If timeout occurs, it will start the work. And if we call
ravb_remove without finishing the work, there may be a
use-after-free bug on ndev.

Fix it by finishing the job before cleanup in ravb_remove.

Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Zheng Wang <zyytlz.wz@....com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
---
v2:
- stop dev_watchdog so that handle no more timeout work suggested by Yunsheng Lin,
add an empty line to make code clear suggested by Sergey Shtylyov
---
 drivers/net/ethernet/renesas/ravb_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 0f54849a3823..eb63ea788e19 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2892,6 +2892,10 @@ static int ravb_remove(struct platform_device *pdev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 
+	netif_carrier_off(ndev);
+	netif_tx_disable(ndev);
+	cancel_work_sync(&priv->work);
+	
 	/* Stop PTP Clock driver */
 	if (info->ccc_gac)
 		ravb_ptp_stop(ndev);
-- 
2.25.1