linux-kernel - [PATCH 4.4 31/75] libertas: fix a potential NULL pointer dereference

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Message-Id: <20210315135209.276935972@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:51:45 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Allen Pais <allen.pais@...cle.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Subject: [PATCH 4.4 31/75] libertas: fix a potential NULL pointer dereference

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Allen Pais <allen.pais@...cle.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@...cle.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[krzk: backport applied to different path - without marvell subdir]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;