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Sun, 3 Jan 2021 05:49:32 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NdhTyt6wAH+F for ; Sun, 3 Jan 2021 05:49:31 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by hemlock.osuosl.org (Postfix) with ESMTPS id 4E64086FD0 for ; Sun, 3 Jan 2021 05:49:31 +0000 (UTC) IronPort-SDR: P9Axmisjw/FSDERxwgGNRrqOoBfT23n2kVChVoFq1DD7zQugF38ZZ+gUPcmM6sbdvCTreC6/o3 rR0lyFyv5ngg== X-IronPort-AV: E=McAfee;i="6000,8403,9852"; a="156639441" X-IronPort-AV: E=Sophos;i="5.78,471,1599548400"; d="scan'208";a="156639441" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jan 2021 21:49:30 -0800 IronPort-SDR: AZJ3z3f/50BAGBVx8UDBX5zmZx51m+XlxeNwiNuVsZHKwRwbKAFslm7Yam1MbcUTkq6wc4xLWU WtLbyvtH3ijQ== X-IronPort-AV: E=Sophos;i="5.78,471,1599548400"; d="scan'208";a="377891336" Received: from blu2-mobl3.ccr.corp.intel.com (HELO [10.255.29.85]) ([10.255.29.85]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jan 2021 21:49:27 -0800 Subject: Re: [PATCH] iommu/intel: Fix memleak in intel_irq_remapping_alloc To: dinghao.liu@zju.edu.cn References: <20210102095029.29053-1-dinghao.liu@zju.edu.cn> <18add30d-a830-c531-6fd2-58a1898b157f@linux.intel.com> <50870a42.15f1a.176c66eaf92.Coremail.dinghao.liu@zju.edu.cn> From: Lu Baolu Message-ID: <6e1ce9ac-ac17-2b16-84d3-a18c011768f2@linux.intel.com> Date: Sun, 3 Jan 2021 13:49:25 +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: <50870a42.15f1a.176c66eaf92.Coremail.dinghao.liu@zju.edu.cn> Content-Language: en-US Cc: Will Deacon , kjlu@umn.edu, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Thomas Gleixner , David Woodhouse , Jiang Liu X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2021/1/3 12:08, dinghao.liu@zju.edu.cn wrote: >> Hi, >> >> On 2021/1/2 17:50, Dinghao Liu wrote: >>> When irq_domain_get_irq_data() or irqd_cfg() fails >>> meanwhile 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 >>> --- >>> 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..cdaeed36750f 100644 >>> --- a/drivers/iommu/intel/irq_remapping.c >>> +++ b/drivers/iommu/intel/irq_remapping.c >>> @@ -1354,6 +1354,8 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain, >>> irq_cfg = irqd_cfg(irq_data); >>> if (!irq_data || !irq_cfg) { >>> ret = -EINVAL; >>> + kfree(data); >>> + data = NULL; >> >> Do you need to check (i == 0) here? @data will not be used anymore as it >> goes to out branch, why setting it to NULL here? >> > > data will be passed to ire_data->chip_data when i == 0 and > intel_free_irq_resources() will free it on failure. Thus I Isn't it going to "goto out_free_data"? If "i == 0", the allocated @data won't be freed by intel_free_irq_resources(), hence memory leaking. Does this patch aim to fix this? Best regards, baolu > set it to NULL to prevent double-free. However, if we add > a check (i == 0) here, we will not need to set it to NULL. > If this is better, I will resend a new patch soon. > > Regards, > Dinghao > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu