netdev - [PATCH 1/2] net: lan966x: Fix potential null-ptr-deref in lan966x_stats

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Message-ID: <20221114133853.5384-2-shangxiaojing@huawei.com>
Date:   Mon, 14 Nov 2022 21:38:52 +0800
From:   Shang XiaoJing <shangxiaojing@...wei.com>
To:     <horatiu.vultur@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <lars.povlsen@...rochip.com>,
        <Steen.Hegelund@...rochip.com>, <daniel.machon@...rochip.com>,
        <rmk+kernel@...linux.org.uk>, <casper.casan@...il.com>,
        <bjarni.jonasson@...rochip.com>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <shangxiaojing@...wei.com>
Subject: [PATCH 1/2] net: lan966x: Fix potential null-ptr-deref in lan966x_stats_init()

lan966x_stats_init() calls create_singlethread_workqueue() and not
checked the ret value, which may return NULL. And a null-ptr-deref may
happen:

lan966x_stats_init()
    create_singlethread_workqueue() # failed, lan966x->stats_queue is NULL
    queue_delayed_work()
        queue_delayed_work_on()
            __queue_delayed_work()  # warning here, but continue
                __queue_work()      # access wq->flags, null-ptr-deref

Check the ret value and return -ENOMEM if it is NULL.

Fixes: 12c2d0a5b8e2 ("net: lan966x: add ethtool configuration and statistics")
Signed-off-by: Shang XiaoJing <shangxiaojing@...wei.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
index e58a27fd8b50..0fb0efc224be 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
@@ -708,6 +708,9 @@ int lan966x_stats_init(struct lan966x *lan966x)
 	snprintf(queue_name, sizeof(queue_name), "%s-stats",
 		 dev_name(lan966x->dev));
 	lan966x->stats_queue = create_singlethread_workqueue(queue_name);
+	if (!lan966x->stats_queue)
+		return -ENOMEM;
+
 	INIT_DELAYED_WORK(&lan966x->stats_work, lan966x_check_stats_work);
 	queue_delayed_work(lan966x->stats_queue, &lan966x->stats_work,
 			   LAN966X_STATS_CHECK_DELAY);
-- 
2.17.1