[PATCH AUTOSEL for 4.9 091/190] libertas: check return value of alloc_workqueue

[Sasha Levin]

From: Pan Bian <bianpan2016@xxxxxxx>

[ Upstream commit dc3f89c38a8406554ffeffa370aad086a9c5e9de ]

Function alloc_workqueue() will return a NULL pointer if there is no
enough memory, and its return value should be validated before using.
However, in function if_spi_probe(), its return value is not checked.
This may result in a NULL dereference bug. This patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 drivers/net/wireless/marvell/libertas/if_spi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/marvell/libertas/if_spi.c b/drivers/net/wireless/marvell/libertas/if_spi.c
index c3a53cd6988e..7b4955cc38db 100644
--- a/drivers/net/wireless/marvell/libertas/if_spi.c
+++ b/drivers/net/wireless/marvell/libertas/if_spi.c
@@ -1181,6 +1181,10 @@ static int if_spi_probe(struct spi_device *spi)
 
 	/* Initialize interrupt handling stuff. */
 	card->workqueue = alloc_workqueue("libertas_spi", WQ_MEM_RECLAIM, 0);
+	if (!card->workqueue) {
+		err = -ENOMEM;
+		goto remove_card;
+	}
 	INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
 	INIT_WORK(&card->resume_work, if_spi_resume_worker);
 
@@ -1209,6 +1213,7 @@ static int if_spi_probe(struct spi_device *spi)
 	free_irq(spi->irq, card);
 terminate_workqueue:
 	destroy_workqueue(card->workqueue);
+remove_card:
 	lbs_remove_card(priv); /* will call free_netdev */
 free_card:
 	free_if_spi_card(card);
-- 
2.14.1