From patchwork Mon Aug 24 20:03:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sumera Priyadarsini X-Patchwork-Id: 1350675 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=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=c2U6POoJ; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Bb32x3nLrz9sTK for ; Tue, 25 Aug 2020 06:03:21 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726968AbgHXUDS (ORCPT ); Mon, 24 Aug 2020 16:03:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725904AbgHXUDR (ORCPT ); Mon, 24 Aug 2020 16:03:17 -0400 Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2653FC061573; Mon, 24 Aug 2020 13:03:17 -0700 (PDT) Received: by mail-pf1-x441.google.com with SMTP id p11so2286394pfn.11; Mon, 24 Aug 2020 13:03:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=isOavbC0CqCTOWpwarMOyw2TDbIMP+uJPiDdCwZdCm4=; b=c2U6POoJvv+0vYTJHvEKQaX7ET3zmfZwu9hCOQz2NJZ+PiNfhFvjFQkeNq2hSR42uW 7S8VHrutiLhiRBILzasdfdAJAUnRG1BHOCXg+p3O3MnhKvLqagdmz9JFCDcXCQjh55oY +f/IPLBAsnBHlUOyvhRwO9nsmc8HG92Qbgce3slKVbJKFawgJNYx1D+Z4lADIh2TFrhG AAQvK+mlzor09CElVJkoHNgs8uWmwthGXkvATFK48jV6B9yy1Bwy7gHmmM7rktLFFFkg xOykXFC2KPGf9A+h/7exWOnjehmtzUPeRqpqsFOFSR19UiXRudkmG3F43aht6Jpr7lZ7 wN7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=isOavbC0CqCTOWpwarMOyw2TDbIMP+uJPiDdCwZdCm4=; b=WTurTcg55fTsQIkCM7103viaEBo7c5mNR0dWsvLqWqNE6Yy123w/ArcPu/I0qUfD3F hIVx8RTq0125wvS2VMxqRdXGsuKffaJojOUC9TkmZqSnhcqZsHc2l5vufs8Ky0gSG9qQ K36SrFnyY2BSyD+/FDqFNXy2y4cocfHqzxyA5BjMLfpdOfRBbdBdFw5Ekujyv/Nh7gfn 87ItI3umJSCW4CqcNtWeBg6/hRffikGpycsKSjabsEN2q+5xKso1pD9UcyAXfNtcgJlo kTsOQMevDs/YcQMBI7eo6veOCm3oRcs0u767oRY7CjkK8nIh6qfuAZemET5s/RAFsqvH WNfg== X-Gm-Message-State: AOAM532YBl5TD3QkNPbJw7QJbkSfIpXUmXe5UxNOr1+jiS5v4dA/P3Bw 3tZqtMeilEtWxjRXeEkpGbg= X-Google-Smtp-Source: ABdhPJyNNJ7ZQ0kH+sJbXxUJ+q4pt6tVcRPH37tIEAQf5D8RdnbjPmfJNMPVfDiij6bCHTAMNMa81g== X-Received: by 2002:a63:7018:: with SMTP id l24mr4221170pgc.55.1598299396720; Mon, 24 Aug 2020 13:03:16 -0700 (PDT) Received: from Kaladin ([49.207.215.194]) by smtp.gmail.com with ESMTPSA id d23sm10418236pgm.11.2020.08.24.13.03.13 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 24 Aug 2020 13:03:16 -0700 (PDT) Date: Tue, 25 Aug 2020 01:33:11 +0530 From: Sumera Priyadarsini To: davem@davemloft.net Cc: Julia.Lawall@lip6.fr, andrew@lunn.ch, sean.wang@mediatek.com, vivien.didelot@gmail.com, f.fainelli@gmail.com, kuba@kernel.org, matthias.bgg@gmail.com, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH V4] net: dsa: mt7530: Add of_node_put() before break and return statements Message-ID: <20200824200311.GA19436@Kaladin> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Every iteration of for_each_child_of_node() decrements the reference count of the previous node, however when control is transferred from the middle of the loop, as in the case of a return or break or goto, there is no decrement thus ultimately resulting in a memory leak. Fix a potential memory leak in mt7530.c by inserting of_node_put() before the break and return statements. Issue found with Coccinelle. Signed-off-by: Sumera Priyadarsini --- Changes in v2: Add another of_node_put() in for_each_child_of_node() as pointed out by Andrew. Changes in v3: - Correct syntax errors - Modify commit message Changes in v4: - Change commit prefix to include the driver name, mt7530, as pointed out by Vladimir. - Change the signoff to the correct format. --- drivers/net/dsa/mt7530.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index 8dcb8a49ab67..4b4701c69fe1 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -1326,14 +1326,17 @@ mt7530_setup(struct dsa_switch *ds) if (phy_node->parent == priv->dev->of_node->parent) { ret = of_get_phy_mode(mac_np, &interface); - if (ret && ret != -ENODEV) + if (ret && ret != -ENODEV) { + of_node_put(mac_np); return ret; + } id = of_mdio_parse_addr(ds->dev, phy_node); if (id == 0) priv->p5_intf_sel = P5_INTF_SEL_PHY_P0; if (id == 4) priv->p5_intf_sel = P5_INTF_SEL_PHY_P4; } + of_node_put(mac_np); of_node_put(phy_node); break; }