releases/4.4.262/libertas-fix-a-potential-null-pointer-dereference.patch

From 7da413a18583baaf35dd4a8eb414fa410367d7f2 Mon Sep 17 00:00:00 2001
From: Allen Pais <allen.pais@oracle.com>
Date: Wed, 18 Sep 2019 22:05:00 +0530
Subject: libertas: fix a potential NULL pointer dereference

From: Allen Pais <allen.pais@oracle.com>

commit 7da413a18583baaf35dd4a8eb414fa410367d7f2 upstream.

alloc_workqueue is not checked for errors and as a result,
a potential NULL dereference could occur.

Signed-off-by: Allen Pais <allen.pais@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[krzk: backport applied to different path - without marvell subdir]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/libertas/if_sdio.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -1229,6 +1229,10 @@ static int if_sdio_probe(struct sdio_fun
 
 	spin_lock_init(&card->lock);
 	card->workqueue = create_workqueue("libertas_sdio");
+	if (unlikely(!card->workqueue)) {
+		ret = -ENOMEM;
+		goto err_queue;
+	}
 	INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker);
 	init_waitqueue_head(&card->pwron_waitq);
 
@@ -1282,6 +1286,7 @@ err_activate_card:
 	lbs_remove_card(priv);
 free:
 	destroy_workqueue(card->workqueue);
+err_queue:
 	while (card->packets) {
 		packet = card->packets;
 		card->packets = card->packets->next;