netdev - [PATCH net v2] net: mhi: Fix memory leak in mhi_net

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Message-Id: <20221111092044.3170908-1-weiyongjun@huaweicloud.com>
Date:   Fri, 11 Nov 2022 09:20:44 +0000
From:   Wei Yongjun <weiyongjun@...weicloud.com>
To:     Loic Poulain <loic.poulain@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>, netdev@...r.kernel.org
Subject: [PATCH net v2] net: mhi: Fix memory leak in mhi_net_dellink()

From: Wei Yongjun <weiyongjun1@...wei.com>

MHI driver registers network device without setting the
needs_free_netdev flag, and does NOT call free_netdev() when
unregisters network device, which causes a memory leak.

This patch calls free_netdev() to fix it since netdev_priv
is used after unregister.

Fixes: 13adac032982 ("net: mhi_net: Register wwan_ops for link creation")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
v1 -> v2: fix 'Fixes' tag

 drivers/net/mhi_net.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index ff302144029d..3d322ac4f6a5 100644
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -343,6 +343,8 @@ static void mhi_net_dellink(struct mhi_device *mhi_dev, struct net_device *ndev)
 
 	kfree_skb(mhi_netdev->skbagg_head);
 
+	free_netdev(ndev);
+
 	dev_set_drvdata(&mhi_dev->dev, NULL);
 }
 
-- 
2.34.1