From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423657AbeE1LIp (ORCPT ); Mon, 28 May 2018 07:08:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:56154 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423615AbeE1LIj (ORCPT ); Mon, 28 May 2018 07:08:39 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Baoquan He , Sebastian Andrzej Siewior , Joerg Roedel , Sasha Levin Subject: [PATCH 4.16 103/272] iommu/amd: Take into account that alloc_dev_data() may return NULL Date: Mon, 28 May 2018 12:02:16 +0200 Message-Id: <20180528100249.761915437@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180528100240.256525891@linuxfoundation.org> References: <20180528100240.256525891@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior [ Upstream commit 39ffe39545cd5cb5b8cee9f0469165cf24dc62c2 ] find_dev_data() does not check whether the return value alloc_dev_data() is NULL. This was okay once because the pointer was returned once as-is. Since commit df3f7a6e8e85 ("iommu/amd: Use is_attach_deferred call-back") the pointer may be used within find_dev_data() so a NULL check is required. Cc: Baoquan He Fixes: df3f7a6e8e85 ("iommu/amd: Use is_attach_deferred call-back") Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/amd_iommu.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -310,6 +310,8 @@ static struct iommu_dev_data *find_dev_d if (dev_data == NULL) { dev_data = alloc_dev_data(devid); + if (!dev_data) + return NULL; if (translation_pre_enabled(iommu)) dev_data->defer_attach = true;