From patchwork Sat Apr 11 12:09:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 228038 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5C15C2BBC7 for ; Sat, 11 Apr 2020 12:23:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 849A120644 for ; Sat, 11 Apr 2020 12:23:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607821; bh=IsHu1Q2jQ/y3A3ru+z2NHMuipfGeub4vJR0w79s8IMI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jEZLMFzCH6lZ3tnYCl7Dm03yPxDeiujvZ8Ct+jKNyR4t9V1qboN4mE+Yggz2wMbMf 3ywd4TrGDhSm1/hgnC1t/aXDfefq5C309n1BFYqw29XAGtTFmQmzzGKclseQ/6Ab+K XKi4W3PRqeJbJxdiQSjTg1qrM86h2n+ZfsZoo+UI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728390AbgDKMTK (ORCPT ); Sat, 11 Apr 2020 08:19:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:54346 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728150AbgDKMTH (ORCPT ); Sat, 11 Apr 2020 08:19:07 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4E0FD20644; Sat, 11 Apr 2020 12:19:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607546; bh=IsHu1Q2jQ/y3A3ru+z2NHMuipfGeub4vJR0w79s8IMI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z/4DX0WUTypUJGtanPI7uHPbMrzRIen2lzG1JazHHJuwGbp7JtgTOBlin+r6V6alC J++8fUeWKFsGhWE/uMy3FCiSnUf/bREtVnPsqP9yGbiK1AXU+Naq2ESgn/HlY6wShn u1oFMDqgtQ0ZdSKvZW1RS8oyj9QrgMqPAS2ThVk4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chuanhong Guo , Vivien Didelot , Florian Fainelli , =?utf-8?q?Ren=C3=A9_van_Dorst?= , "David S. Miller" Subject: [PATCH 5.5 05/44] net: dsa: mt7530: fix null pointer dereferencing in port5 setup Date: Sat, 11 Apr 2020 14:09:25 +0200 Message-Id: <20200411115457.320502993@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200411115456.934174282@linuxfoundation.org> References: <20200411115456.934174282@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chuanhong Guo [ Upstream commit 0452800f6db4ed0a42ffb15867c0acfd68829f6a ] The 2nd gmac of mediatek soc ethernet may not be connected to a PHY and a phy-handle isn't always available. Unfortunately, mt7530 dsa driver assumes that the 2nd gmac is always connected to switch port 5 and setup mt7530 according to phy address of 2nd gmac node, causing null pointer dereferencing when phy-handle isn't defined in dts. This commit fix this setup code by checking return value of of_parse_phandle before using it. Fixes: 38f790a80560 ("net: dsa: mt7530: Add support for port 5") Signed-off-by: Chuanhong Guo Reviewed-by: Vivien Didelot Reviewed-by: Florian Fainelli Tested-by: René van Dorst Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/dsa/mt7530.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -1355,6 +1355,9 @@ mt7530_setup(struct dsa_switch *ds) continue; phy_node = of_parse_phandle(mac_np, "phy-handle", 0); + if (!phy_node) + continue; + if (phy_node->parent == priv->dev->of_node->parent) { ret = of_get_phy_mode(mac_np, &interface); if (ret && ret != -ENODEV)