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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 72E83C43463 for ; Fri, 18 Sep 2020 02:18:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30EE323600 for ; Fri, 18 Sep 2020 02:18:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395495; bh=pL8HchNcTxz2hexpSqJFIVrWoEqs3+yYGAGoxMaHPdw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Pgrg6ijY57fggK23Bkzv64ay/lSQGOQeb6InAMXbkY76UyzsiRGwBST5pg4R/RcIF I12jJ1yW6TEhA8Seob3B4oJAtHsb3w/XWYG0E7Wq2nE1f2o0Rz5BW/woT5R5WDx/qG zSbgtrYcf6E6DM5nZWdrydhjrA0TAGVEHTJAE0SQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729662AbgIRCSO (ORCPT ); Thu, 17 Sep 2020 22:18:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:49148 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728371AbgIRCSA (ORCPT ); Thu, 17 Sep 2020 22:18:00 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0EF5323600; Fri, 18 Sep 2020 02:17:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395479; bh=pL8HchNcTxz2hexpSqJFIVrWoEqs3+yYGAGoxMaHPdw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xK1/5iYoGygkKMd9AXNnprX0ujWqmYMy8YWC51jgyiIxzuhMQmJr3ujuBYyh26GhL +ehg3J8NQ/dym/DJFdBNQYPR0MRBDcxsVInciSaKBZHCoIW59HkElplHdEgnrzJwTs fgkhUaSuehrBlMObXfgnRj7fmLG4cJvkzXQYdvcE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alex Williamson , Qian Cai , Daniel Wagner , Cornelia Huck , Sasha Levin , kvm@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 63/64] vfio/pci: Clear error and request eventfd ctx after releasing Date: Thu, 17 Sep 2020 22:16:42 -0400 Message-Id: <20200918021643.2067895-63-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918021643.2067895-1-sashal@kernel.org> References: <20200918021643.2067895-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alex Williamson [ Upstream commit 5c5866c593bbd444d0339ede6a8fb5f14ff66d72 ] The next use of the device will generate an underflow from the stale reference. Cc: Qian Cai Fixes: 1518ac272e78 ("vfio/pci: fix memory leaks of eventfd ctx") Reported-by: Daniel Wagner Reviewed-by: Cornelia Huck Tested-by: Daniel Wagner Signed-off-by: Alex Williamson Signed-off-by: Sasha Levin --- drivers/vfio/pci/vfio_pci.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index ab765770e8dd6..662ea7ec82926 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -255,10 +255,14 @@ static void vfio_pci_release(void *device_data) if (!(--vdev->refcnt)) { vfio_spapr_pci_eeh_release(vdev->pdev); vfio_pci_disable(vdev); - if (vdev->err_trigger) + if (vdev->err_trigger) { eventfd_ctx_put(vdev->err_trigger); - if (vdev->req_trigger) + vdev->err_trigger = NULL; + } + if (vdev->req_trigger) { eventfd_ctx_put(vdev->req_trigger); + vdev->req_trigger = NULL; + } } mutex_unlock(&driver_lock); -- 2.25.1