From: Shang XiaoJing <shangxiaojing@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 01be7bd84181..30815c0e3f76 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -657,6 +657,9 @@ 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);
--
2.35.1
