From mboxrd@z Thu Jan 1 00:00:00 1970 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=-15.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 3A781C433E0 for ; Tue, 5 Jan 2021 08:39:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC6E822525 for ; Tue, 5 Jan 2021 08:39:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727524AbhAEIjz (ORCPT ); Tue, 5 Jan 2021 03:39:55 -0500 Received: from mga04.intel.com ([192.55.52.120]:21264 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725768AbhAEIjy (ORCPT ); Tue, 5 Jan 2021 03:39:54 -0500 IronPort-SDR: 1huZwnIguLSFcmFzyQEicRkhd1rrfmFxD9P28DarCKWBiv5FtfQRX+WLpF/xvAp1XxHdoHGaUi t5ZgLs/qHwJQ== X-IronPort-AV: E=McAfee;i="6000,8403,9854"; a="174497023" X-IronPort-AV: E=Sophos;i="5.78,476,1599548400"; d="scan'208";a="174497023" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2021 00:38:08 -0800 IronPort-SDR: fjso8MDkRt0bDaK8tjG9nFUo6M26/FF0GM8Ay7tk7D+GSlb6ccB7iq6K9rt2D8VZzbMpAgT+rI 6JOCBkzCDFLw== X-IronPort-AV: E=Sophos;i="5.78,476,1599548400"; d="scan'208";a="421700560" Received: from blu2-mobl3.ccr.corp.intel.com (HELO [10.249.171.36]) ([10.249.171.36]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2021 00:38:06 -0800 Cc: baolu.lu@linux.intel.com, David Woodhouse , Joerg Roedel , Will Deacon , Thomas Gleixner , Jiang Liu , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] [v2] iommu/intel: Fix memleak in intel_irq_remapping_alloc To: Dinghao Liu , kjlu@umn.edu References: <20210105051837.32118-1-dinghao.liu@zju.edu.cn> From: Lu Baolu Message-ID: Date: Tue, 5 Jan 2021 16:38:04 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210105051837.32118-1-dinghao.liu@zju.edu.cn> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/1/5 13:18, Dinghao Liu wrote: > When irq_domain_get_irq_data() or irqd_cfg() fails > at i == 0, data allocated by kzalloc() has not been > freed before returning, which leads to memleak. > > Fixes: b106ee63abccb ("irq_remapping/vt-d: Enhance Intel IR driver to support hierarchical irqdomains") > Signed-off-by: Dinghao Liu Acked-by: Lu Baolu Best regards, baolu > --- > > Changelog: > > v2: - Add a check against i instead of setting data to NULL. > --- > drivers/iommu/intel/irq_remapping.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c > index aeffda92b10b..685200a5cff0 100644 > --- a/drivers/iommu/intel/irq_remapping.c > +++ b/drivers/iommu/intel/irq_remapping.c > @@ -1353,6 +1353,8 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain, > irq_data = irq_domain_get_irq_data(domain, virq + i); > irq_cfg = irqd_cfg(irq_data); > if (!irq_data || !irq_cfg) { > + if (!i) > + kfree(data); > ret = -EINVAL; > goto out_free_data; > } >