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From: Shang XiaoJing <shangxiaojing@huawei.com>
To: <horatiu.vultur@microchip.com>, <UNGLinuxDriver@microchip.com>,
	<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
	<pabeni@redhat.com>, <lars.povlsen@microchip.com>,
	<Steen.Hegelund@microchip.com>, <daniel.machon@microchip.com>,
	<rmk+kernel@armlinux.org.uk>, <casper.casan@gmail.com>,
	<bjarni.jonasson@microchip.com>, <netdev@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Cc: <shangxiaojing@huawei.com>
Subject: [PATCH 2/2] net: microchip: sparx5: Fix potential null-ptr-deref in sparx_stats_init() and sparx5_start()
Date: Mon, 14 Nov 2022 21:38:53 +0800	[thread overview]
Message-ID: <20221114133853.5384-3-shangxiaojing@huawei.com> (raw)
In-Reply-To: <20221114133853.5384-1-shangxiaojing@huawei.com>

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

sparx_stats_init()
    create_singlethread_workqueue() # failed, sparx5->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. So as
sparx5_start().

Fixes: af4b11022e2d ("net: sparx5: add ethtool configuration and statistics support")
Fixes: b37a1bae742f ("net: sparx5: add mactable support")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c | 3 +++
 drivers/net/ethernet/microchip/sparx5/sparx5_main.c    | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
index 6b0febcb7fa9..01f3a3a41cdb 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
@@ -1253,6 +1253,9 @@ int sparx_stats_init(struct sparx5 *sparx5)
 	snprintf(queue_name, sizeof(queue_name), "%s-stats",
 		 dev_name(sparx5->dev));
 	sparx5->stats_queue = create_singlethread_workqueue(queue_name);
+	if (!sparx5->stats_queue)
+		return -ENOMEM;
+
 	INIT_DELAYED_WORK(&sparx5->stats_work, sparx5_check_stats_work);
 	queue_delayed_work(sparx5->stats_queue, &sparx5->stats_work,
 			   SPX5_STATS_CHECK_DELAY);
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index 62a325e96345..eeac04b84638 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -659,6 +659,9 @@ static int sparx5_start(struct sparx5 *sparx5)
 	snprintf(queue_name, sizeof(queue_name), "%s-mact",
 		 dev_name(sparx5->dev));
 	sparx5->mact_queue = create_singlethread_workqueue(queue_name);
+	if (!sparx5->mact_queue)
+		return -ENOMEM;
+
 	INIT_DELAYED_WORK(&sparx5->mact_work, sparx5_mact_pull_work);
 	queue_delayed_work(sparx5->mact_queue, &sparx5->mact_work,
 			   SPX5_MACT_PULL_DELAY);
-- 
2.17.1


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  parent reply	other threads:[~2022-11-14 13:44 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-14 13:38 [PATCH 0/2] net: microchip: Fix potential null-ptr-deref due to create_singlethread_workqueue() Shang XiaoJing
2022-11-14 13:38 ` [PATCH 1/2] net: lan966x: Fix potential null-ptr-deref in lan966x_stats_init() Shang XiaoJing
2022-11-14 14:20   ` Horatiu Vultur
2022-11-14 13:38 ` Shang XiaoJing [this message]
2022-11-16  9:20 ` [PATCH 0/2] net: microchip: Fix potential null-ptr-deref due to create_singlethread_workqueue() patchwork-bot+netdevbpf

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