net: microchip: sparx5: Fix potential null-ptr-deref in sparx_stats_init() and sparx5...

[ Upstream commit 639f5d006e36bb303f525d9479448c412b720c39 ]

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
index 10b866e..060274c 100644 (file)
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
@@ -1219,6 +1219,9 @@ 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 5030dfc..435ac22 100644 (file)
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -629,6 +629,9 @@ 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);