netdev - [PATCH 2/2] net: microchip: sparx5: Fix potential null-ptr-deref in sparx_stats_init() and sparx5

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Message-ID: <20221114133853.5384-3-shangxiaojing@huawei.com>
Date:   Mon, 14 Nov 2022 21:38:53 +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 2/2] net: microchip: sparx5: Fix potential null-ptr-deref in sparx_stats_init() and sparx5_start()

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@...wei.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