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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,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 23029C433E3 for ; Mon, 25 May 2020 13:01:43 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E26822073B for ; Mon, 25 May 2020 13:01:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E26822073B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id AD766204E0; Mon, 25 May 2020 13:01:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DaEO0jhp2bO3; Mon, 25 May 2020 13:01:40 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id B67E32010A; Mon, 25 May 2020 13:01:40 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id A2333C0865; Mon, 25 May 2020 13:01:40 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id DB438C016F for ; Mon, 25 May 2020 13:01:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id C335485FA6 for ; Mon, 25 May 2020 13:01:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2V1DWc6-tOPX for ; Mon, 25 May 2020 13:01:34 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by fraxinus.osuosl.org (Postfix) with ESMTPS id C4C3185FA3 for ; Mon, 25 May 2020 13:01:34 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 4D934327; Mon, 25 May 2020 15:01:29 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel Subject: [PATCH] iommu: Don't take group reference in iommu_alloc_default_domain() Date: Mon, 25 May 2020 15:01:22 +0200 Message-Id: <20200525130122.380-1-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 Cc: iommu@lists.linux-foundation.org, Joerg Roedel , linux-kernel@vger.kernel.org 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: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" From: Joerg Roedel The iommu_alloc_default_domain() function takes a reference to an IOMMU group without releasing it. This causes the group to never be released, with undefined side effects. The function has only one call-site, which takes a group reference on its own, so to fix this leak, do not take another reference in iommu_alloc_default_domain() and pass the group as a function parameter instead. Reference: https://lore.kernel.org/lkml/20200522130145.30067-1-saiprakash.ranjan@codeaurora.org/ Reported-by: Sai Prakash Ranjan Cc: Sai Prakash Ranjan Fixes: 6e1aa2049154 ("iommu: Move default domain allocation to iommu_probe_device()") Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 374b34fd6fac..bf20674769e0 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -80,7 +80,8 @@ static bool iommu_cmd_line_dma_api(void) return !!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API); } -static int iommu_alloc_default_domain(struct device *dev); +static int iommu_alloc_default_domain(struct iommu_group *group, + struct device *dev); static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, unsigned type); static int __iommu_attach_device(struct iommu_domain *domain, @@ -251,17 +252,17 @@ int iommu_probe_device(struct device *dev) if (ret) goto err_out; + group = iommu_group_get(dev); + if (!group) + goto err_release; + /* * Try to allocate a default domain - needs support from the * IOMMU driver. There are still some drivers which don't * support default domains, so the return value is not yet * checked. */ - iommu_alloc_default_domain(dev); - - group = iommu_group_get(dev); - if (!group) - goto err_release; + iommu_alloc_default_domain(group, dev); if (group->default_domain) ret = __iommu_attach_device(group->default_domain, dev); @@ -1478,15 +1479,11 @@ static int iommu_group_alloc_default_domain(struct bus_type *bus, return 0; } -static int iommu_alloc_default_domain(struct device *dev) +static int iommu_alloc_default_domain(struct iommu_group *group, + struct device *dev) { - struct iommu_group *group; unsigned int type; - group = iommu_group_get(dev); - if (!group) - return -ENODEV; - if (group->default_domain) return 0; -- 2.26.2 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu