From patchwork Wed Dec 2 11:45:10 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin Ian King X-Patchwork-Id: 551340 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id C9A5214016A for ; Wed, 2 Dec 2015 22:45:40 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758018AbbLBLpV (ORCPT ); Wed, 2 Dec 2015 06:45:21 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:41028 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757893AbbLBLpS (ORCPT ); Wed, 2 Dec 2015 06:45:18 -0500 Received: from 1.general.cking.us.vpn ([10.172.65.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.76) (envelope-from ) id 1a45qS-0005Tq-1R; Wed, 02 Dec 2015 11:45:12 +0000 From: Colin King To: kernel-tram@lists.ubuntu.com, Brett Rudley , Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo , Pieter-Paul Giesberts , Arnd Bergmann , linux-wireless@vger.kernel.org, brcm80211-dev-list@broadcom.com, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH] brcmfmac: only lock and unlock fws if fws is not null Date: Wed, 2 Dec 2015 11:45:10 +0000 Message-Id: <1449056710-9776-1-git-send-email-colin.king@canonical.com> X-Mailer: git-send-email 2.6.2 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Colin Ian King 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 Acked-by: Arend van Spriel --- 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; }