linux-kernel - [PATCH] brcmfmac: only lock and unlock fws if fws is not null

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Message-Id: <1449056710-9776-1-git-send-email-colin.king@canonical.com>
Date:	Wed,  2 Dec 2015 11:45:10 +0000
From:	Colin King <colin.king@...onical.com>
To:	kernel-tram@...ts.ubuntu.com, Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	Franky Lin <frankyl@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Arnd Bergmann <arnd@...db.de>, linux-wireless@...r.kernel.org,
	brcm80211-dev-list@...adcom.com, netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] brcmfmac: only lock and unlock fws if fws is not null

From: Colin Ian King <colin.king@...onical.com>

There is a null ptr check for fws to set bcmc_credit_check, however,
there a lock and unlock on fws should only performed if fwts is
also not null to also avoid a potential null pointer deference.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c b/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
index 086cac3..092f33f 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
@@ -1609,10 +1609,11 @@ static int brcmf_fws_notify_bcmc_credit_support(struct brcmf_if *ifp,
 {
 	struct brcmf_fws_info *fws = ifp->drvr->fws;
 
-	brcmf_fws_lock(fws);
-	if (fws)
+	if (fws) {
+		brcmf_fws_lock(fws);
 		fws->bcmc_credit_check = true;
-	brcmf_fws_unlock(fws);
+		brcmf_fws_unlock(fws);
+	}
 	return 0;
 }
 
-- 
2.6.2

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