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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 DF75FC55179 for ; Tue, 27 Oct 2020 14:26:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A772F22202 for ; Tue, 27 Oct 2020 14:26:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808776; bh=0jkClK8mVRrdFdEr2nOJ0GaA3EDBxXgPqMe58Z54eY0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ptmJQpHuBOVvm1rlI/kdOU0c1SHauWCUsAoVL8LQuaYuzLbXiSgWaCvrgtpx41JUF 24jY+RnMJdveu46HTHgJFJFZNQh3Gypr24NerAmLstlAt6Y7gu16khWt/f6dJGaaG/ 9OGCXp7rUpKlTq6KWMd4ZAMapVjsrdLC4+YVWaY0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2901745AbgJ0O0P (ORCPT ); Tue, 27 Oct 2020 10:26:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:51182 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2901640AbgJ0OZm (ORCPT ); Tue, 27 Oct 2020 10:25:42 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5F3A920790; Tue, 27 Oct 2020 14:25:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808742; bh=0jkClK8mVRrdFdEr2nOJ0GaA3EDBxXgPqMe58Z54eY0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I2iMnX6xdZqRCmfz8ptgjYbBF3fSwqoCT4rfgoWPtUHP/LewhB2eawoQvBl5BF5ng 5BsXJOoknRIRr6TncpZqf+iHAotqEZjE0IQ27CjD0gvA7HJHZqcJaA9O8KIvAMrXmd 9VX91RVA5fCf4Xq8IomZG1z9Eemg+xmFFr9g+66s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, guomin chen , Alex Williamson , Sasha Levin Subject: [PATCH 4.19 179/264] vfio/pci: Clear token on bypass registration failure Date: Tue, 27 Oct 2020 14:53:57 +0100 Message-Id: <20201027135439.084501071@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135430.632029009@linuxfoundation.org> References: <20201027135430.632029009@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alex Williamson [ Upstream commit 852b1beecb6ff9326f7ca4bc0fe69ae860ebdb9e ] The eventfd context is used as our irqbypass token, therefore if an eventfd is re-used, our token is the same. The irqbypass code will return an -EBUSY in this case, but we'll still attempt to unregister the producer, where if that duplicate token still exists, results in removing the wrong object. Clear the token of failed producers so that they harmlessly fall out when unregistered. Fixes: 6d7425f109d2 ("vfio: Register/unregister irq_bypass_producer") Reported-by: guomin chen Tested-by: guomin chen Signed-off-by: Alex Williamson Signed-off-by: Sasha Levin --- drivers/vfio/pci/vfio_pci_intrs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c index bdfdd506bc588..c989f777bf771 100644 --- a/drivers/vfio/pci/vfio_pci_intrs.c +++ b/drivers/vfio/pci/vfio_pci_intrs.c @@ -355,11 +355,13 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev, vdev->ctx[vector].producer.token = trigger; vdev->ctx[vector].producer.irq = irq; ret = irq_bypass_register_producer(&vdev->ctx[vector].producer); - if (unlikely(ret)) + if (unlikely(ret)) { dev_info(&pdev->dev, "irq bypass producer (token %p) registration fails: %d\n", vdev->ctx[vector].producer.token, ret); + vdev->ctx[vector].producer.token = NULL; + } vdev->ctx[vector].trigger = trigger; return 0; -- 2.25.1