From patchwork Thu Sep 22 08:44:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 9344743 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1B96F601C2 for ; Thu, 22 Sep 2016 08:44:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0D56B2A8D5 for ; Thu, 22 Sep 2016 08:44:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 024262A8D9; Thu, 22 Sep 2016 08:44:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C590F2A8D5 for ; Thu, 22 Sep 2016 08:44:45 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bmzca-0002XM-RX; Thu, 22 Sep 2016 08:44:44 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bmzcX-0002Uo-Vf for linux-mediatek@lists.infradead.org; Thu, 22 Sep 2016 08:44:42 +0000 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1538205252; Thu, 22 Sep 2016 16:44:18 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Thu, 22 Sep 2016 16:40:56 +0800 From: To: , Subject: [PATCH net-next] net: ethernet: mediatek: get out of potential invalid pointer access Date: Thu, 22 Sep 2016 16:44:16 +0800 Message-ID: <1474533856-22753-1-git-send-email-sean.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160922_014442_184674_78711756 X-CRM114-Status: UNSURE ( 9.30 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nbd@openwrt.org, keyhaede@gmail.com, netdev@vger.kernel.org, Sean Wang , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, objelf@gmail.com Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sean Wang Potential dangerous invalid pointer might be accessed if the error happens when couple phy_device to net_device so cleanup the error path. Signed-off-by: Sean Wang --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index a65801a..3d7e0cb 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -296,7 +296,9 @@ static int mtk_phy_connect(struct net_device *dev) regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val); /* couple phydev to net_device */ - mtk_phy_connect_node(eth, mac, np); + if (mtk_phy_connect_node(eth, mac, np)) + goto err_phy; + dev->phydev->autoneg = AUTONEG_ENABLE; dev->phydev->speed = 0; dev->phydev->duplex = 0; @@ -317,7 +319,7 @@ static int mtk_phy_connect(struct net_device *dev) err_phy: of_node_put(np); - dev_err(eth->dev, "invalid phy_mode\n"); + dev_err(eth->dev, "%s: invalid phy\n", __func__); return -EINVAL; }