From patchwork Thu Jan 30 17:44:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 1231540 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=walle.cc Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=walle.cc header.i=@walle.cc header.a=rsa-sha256 header.s=mail2016061301 header.b=JSrCSURs; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 487p0Y1cWDz9sNx for ; Fri, 31 Jan 2020 04:55:09 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727558AbgA3RzG (ORCPT ); Thu, 30 Jan 2020 12:55:06 -0500 Received: from ssl.serverraum.org ([176.9.125.105]:50645 "EHLO ssl.serverraum.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727333AbgA3RzF (ORCPT ); Thu, 30 Jan 2020 12:55:05 -0500 Received: from apollo.fritz.box (unknown [IPv6:2a02:810c:c200:2e91:6257:18ff:fec4:ca34]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 2FB0B2305C; Thu, 30 Jan 2020 18:45:06 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1580406309; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=HHpCOJ8JX5SEm2UJ7ps+5qppNNw1zZGQMy85Ld7opXo=; b=JSrCSURsgccrSywbAtlO6PXcCqRobXYVZA90dLCH9+74fLJAuMEU+6E3b1hBRBmrgaZgs+ madwBRx0XI/EJ61MizOe5iwpIuWF3CFvFt927r5+AkwT8XnjPnW5aMfup4jG/5QJxQiL11 d5kg74ug9RbaH7IBqDQ3LIK/cpOhIqk= From: Michael Walle To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: Richard Cochran , Russell King , Heiner Kallweit , Florian Fainelli , Andrew Lunn , Michael Walle Subject: [PATCH net-next 1/2] net: mdio: of: fix potential NULL pointer derefernce Date: Thu, 30 Jan 2020 18:44:50 +0100 Message-Id: <20200130174451.17951-1-michael@walle.cc> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Spamd-Bar: ++++++ X-Spam-Level: ****** X-Rspamd-Server: web X-Spam-Status: Yes, score=6.40 X-Spam-Score: 6.40 X-Rspamd-Queue-Id: 2FB0B2305C X-Spamd-Result: default: False [6.40 / 15.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; BROKEN_CONTENT_TYPE(1.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[]; RCPT_COUNT_SEVEN(0.00)[8]; MID_CONTAINS_FROM(1.00)[]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:31334, ipnet:2a02:810c::/31, country:DE]; FREEMAIL_CC(0.00)[gmail.com,armlinux.org.uk,lunn.ch,walle.cc]; SUSPICIOUS_RECIPS(1.50)[] X-Spam: Yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org of_find_mii_timestamper() returns NULL if no timestamper is found. Therefore, guard the unregister_mii_timestamper() calls. Fixes: 1dca22b18421 ("net: mdio: of: Register discovered MII time stampers.") Signed-off-by: Michael Walle Acked-by: Richard Cochran --- drivers/of/of_mdio.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index f5c2a5487761..db0ed5879803 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -81,13 +81,15 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, else phy = get_phy_device(mdio, addr, is_c45); if (IS_ERR(phy)) { - unregister_mii_timestamper(mii_ts); + if (mii_ts) + unregister_mii_timestamper(mii_ts); return PTR_ERR(phy); } rc = of_irq_get(child, 0); if (rc == -EPROBE_DEFER) { - unregister_mii_timestamper(mii_ts); + if (mii_ts) + unregister_mii_timestamper(mii_ts); phy_device_free(phy); return rc; } @@ -116,7 +118,8 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, * register it */ rc = phy_device_register(phy); if (rc) { - unregister_mii_timestamper(mii_ts); + if (mii_ts) + unregister_mii_timestamper(mii_ts); phy_device_free(phy); of_node_put(child); return rc;