From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8E9FA15C83 for ; Mon, 5 Dec 2022 19:37:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12C2FC43470; Mon, 5 Dec 2022 19:37:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670269035; bh=qLEMbP7r7xm6Qpj1gT3ttgWRibNJiPBThRWnL8Cu38A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fY0gxlvuBrg+3lOSBAjGqoJQ+a1/DfwLAJe1to9AEK1UitxyGWr3k7iWR+onaKmsR 1V84kFrDIK8a5VwispoxyLGNOS2GNiLtajg2ZP0MGyn7wjjoDW2coBNfxpY2NGMfsD 5q0xu8SXLkCL3xh08ojfMwctiKkOzaIKNBIhKlkw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiongfeng Wang , Lu Baolu , Joerg Roedel , Sasha Levin Subject: [PATCH 5.15 101/120] iommu/vt-d: Fix PCI device refcount leak in has_external_pci() Date: Mon, 5 Dec 2022 20:10:41 +0100 Message-Id: <20221205190809.588041248@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190806.528972574@linuxfoundation.org> References: <20221205190806.528972574@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xiongfeng Wang [ Upstream commit afca9e19cc720bfafc75dc5ce429c185ca93f31d ] for_each_pci_dev() is implemented by pci_get_device(). The comment of pci_get_device() says that it will increase the reference count for the returned pci_dev and also decrease the reference count for the input pci_dev @from if it is not NULL. If we break for_each_pci_dev() loop with pdev not NULL, we need to call pci_dev_put() to decrease the reference count. Add the missing pci_dev_put() before 'return true' to avoid reference count leak. Fixes: 89a6079df791 ("iommu/vt-d: Force IOMMU on for platform opt in hint") Signed-off-by: Xiongfeng Wang Link: https://lore.kernel.org/r/20221121113649.190393-2-wangxiongfeng2@huawei.com Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/intel/iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index fa0cf1c3775d..751ff91af0ff 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4241,8 +4241,10 @@ static inline bool has_external_pci(void) struct pci_dev *pdev = NULL; for_each_pci_dev(pdev) - if (pdev->external_facing) + if (pdev->external_facing) { + pci_dev_put(pdev); return true; + } return false; } -- 2.35.1