netdev - [PATCH v2] mwifiex: fix possible NULL dereference

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Message-Id: <1460461597-7309-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Tue, 12 Apr 2016 17:16:37 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Amitkumar Karwar <akarwar@...vell.com>,
	Nishant Sarmukadam <nishants@...vell.com>,
	Kalle Valo <kvalo@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
	Christian Daudt <csd@...adcom.com>
Subject: [PATCH v2] mwifiex: fix possible NULL dereference

From: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>

We have a check for card just after dereferencing it. So if it is NULL
we have already dereferenced it before its check. Lets dereference it
after checking card for NULL.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/net/wireless/marvell/mwifiex/pcie.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index edf8b07..d4db9db 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -2884,10 +2884,11 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
 {
 	struct pcie_service_card *card = adapter->card;
 	const struct mwifiex_pcie_card_reg *reg;
-	struct pci_dev *pdev = card->dev;
 	int i;
 
 	if (card) {
+		struct pci_dev *pdev = card->dev;
+
 		if (card->msix_enable) {
 			for (i = 0; i < MWIFIEX_NUM_MSIX_VECTORS; i++)
 				synchronize_irq(card->msix_entries[i].vector);
-- 
1.9.1