From nobody Tue Sep 16 17:48:00 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E43E4C10F1B for ; Fri, 30 Dec 2022 08:31:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234832AbiL3Ibg (ORCPT ); Fri, 30 Dec 2022 03:31:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234529AbiL3Ibd (ORCPT ); Fri, 30 Dec 2022 03:31:33 -0500 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CF52F4B for ; Fri, 30 Dec 2022 00:31:32 -0800 (PST) Received: by mail-pf1-x42f.google.com with SMTP id 18so1894997pfx.7 for ; Fri, 30 Dec 2022 00:31:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=HPSc5CLczFof6Az09YQrNvJzlEU7+w21O5dXtl4mqyk=; b=lMGhHsMvJXqUL1WfSWtNrtoqQ6vbQ8zSMbNi4ZfLr6yGd+iI9hh2xm4OY8u6H0Go1a CRiG/cfzwsPXQBIKH0SNonLyEto/TmbUZtxEFKTtqIYL66ODBGy0t4WXObCEICe3kDGR 8YRC4yRX/fhYyCflh9NNuUvujL/14pnsIISl0GQerrQRob8bRGlyVcutFiYh9C8KUjdL VbiLNF1sse3ZJoGI/Wvw+ZNu4HUap0FfEfHaBX1uNsAkyuEZSVgQ80sj1Q3YLo7rgnLo xZ2pxM4v2cGvbNPgTPF/11XWj/vW70W8z/kP3EnBjVJB+hw4e4VGS+OM3TbIkUvvuOIF EvEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=HPSc5CLczFof6Az09YQrNvJzlEU7+w21O5dXtl4mqyk=; b=deP1tfBWXKjTe5XEeHZjQYbtEyC+Fa4Z35egUHtBcLydi7hvR24vnRfF91XdPgI5E/ k7cOc88J/KQw68ZRQNlfQeGvW5QWfb5aHj0x+c99ICaaNGAZAMJYuFhOgypqmGpstZ9D b7OaYEm8637Qknwe05Wfp9clU9uMzSeIo4PkkHyQe38XDzJZhNnkEHf325sFHvabpWeJ eEWuCoWiypwMg7GmJFVRz6YYsG1kgzufGhk9PtblRYYjyhgwUVZKLym2afWsDDVnbSt8 cMZ9ZkpsHIqjjGq33nC3zoH4ECHbC4XuC3TVeMTt06VxkJqdVQcOC5cpDSImbh1DI4+j EocA== X-Gm-Message-State: AFqh2kplSRi1lhcArbFSAunysYbS73qkiBxz46+DdCLDJ8I+K4g8HCqG ZPiVTKcsJEFQ77OH3rowFc0= X-Google-Smtp-Source: AMrXdXtJsKuFq/yA8finz6BSFXjWdGZhmxoS70wa6aAQdiMsdDW7v9DTz++wMC4LjcQsJ/9B8bgXLg== X-Received: by 2002:a62:404:0:b0:581:91d1:3cc4 with SMTP id 4-20020a620404000000b0058191d13cc4mr8260380pfe.7.1672389091733; Fri, 30 Dec 2022 00:31:31 -0800 (PST) Received: from localhost.localdomain ([202.120.234.246]) by smtp.googlemail.com with ESMTPSA id 68-20020a621947000000b00580e679dcf2sm10182227pfz.157.2022.12.30.00.31.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Dec 2022 00:31:31 -0800 (PST) From: Miaoqian Lin To: Joerg Roedel , Will Deacon , Robin Murphy , Lu Baolu , Kevin Tian , Eric Auger , Jason Gunthorpe , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Cc: linmq006@gmail.com Subject: [PATCH] iommu: Fix refcount leak in iommu_device_claim_dma_owner Date: Fri, 30 Dec 2022 12:31:00 +0400 Message-Id: <20221230083100.1489569-1-linmq006@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" iommu_group_get() returns the group with the reference incremented. Move iommu_group_get() after owner check to fix the refcount leak. Fixes: 89395ccedbc1 ("iommu: Add device-centric DMA ownership interfaces") Signed-off-by: Miaoqian Lin Reviewed-by: Lu Baolu --- drivers/iommu/iommu.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index de91dd88705b..3a7dd8b61fab 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -3185,14 +3185,16 @@ EXPORT_SYMBOL_GPL(iommu_group_claim_dma_owner); */ int iommu_device_claim_dma_owner(struct device *dev, void *owner) { - struct iommu_group *group =3D iommu_group_get(dev); + struct iommu_group *group =3D NULL; int ret =3D 0; =20 - if (!group) - return -ENODEV; if (WARN_ON(!owner)) return -EINVAL; =20 + group =3D iommu_group_get(dev); + if (!group) + return -ENODEV; + mutex_lock(&group->mutex); if (group->owner_cnt) { if (group->owner !=3D owner) { --=20 2.25.1