Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Winnie Chang <winnie.chang@cypress.com>,
        Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.18 102/197] brcmfmac: fix brcmf_wiphy_wowl_params() NULL pointer dereference
Date:   Thu, 13 Sep 2018 15:30:51 +0200
Message-Id: <20180913131845.625470873@linuxfoundation.org>
In-Reply-To: <20180913131841.568116777@linuxfoundation.org>
References: <20180913131841.568116777@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Winnie Chang <winnie.chang@cypress.com>

[ Upstream commit 27a8aea13053700ad2a08189024df7e341d1ee51 ]

The kernel BUG happens when wowl is enabled from firmware. In
brcmf_wiphy_wowl_params(), cfg is a NULL pointer because it is
drvr->config returned from wiphy_to_cfg(), and drvr->config is not set
yet. To fix it, set drvr->config before brcmf_setup_wiphy() which
calls brcmf_wiphy_wowl_params().

Fixes: 856d5a011c86 ("brcmfmac: allocate struct brcmf_pub instance using wiphy_new()")
Signed-off-by: Winnie Chang <winnie.chang@cypress.com>
Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -6926,15 +6926,15 @@ struct brcmf_cfg80211_info *brcmf_cfg802
 	cfg->d11inf.io_type = (u8)io_type;
 	brcmu_d11_attach(&cfg->d11inf);
 
-	err = brcmf_setup_wiphy(wiphy, ifp);
-	if (err < 0)
-		goto priv_out;
-
 	/* regulatory notifer below needs access to cfg so
 	 * assign it now.
 	 */
 	drvr->config = cfg;
 
+	err = brcmf_setup_wiphy(wiphy, ifp);
+	if (err < 0)
+		goto priv_out;
+
 	brcmf_dbg(INFO, "Registering custom regulatory\n");
 	wiphy->reg_notifier = brcmf_cfg80211_reg_notifier;
 	wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;