From patchwork Tue Oct 27 13:53:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 289968 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, 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 4A411C56202 for ; Tue, 27 Oct 2020 14:41:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFEA1222EA for ; Tue, 27 Oct 2020 14:41:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603809701; bh=i9pwAcbMBFwVFvTsy6gwZlshudc99nSg7f/5QAsJM/4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iW553e0DSMHXG2vDnCgtv9E9HfxWntqbRJSKQcP06EtxdJcZ9h4FZeXdGy5+5WFfN FYREA87ff6UDvJVUyCmm6dc5vSvsaItTVpRJ937UmuaWA1Bw89ks03Gf01JRG3e+rA F1PIXW0CU+w4fHwBAc/QFL0P6j5aig3xn+EPMMgM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762252AbgJ0Oli (ORCPT ); Tue, 27 Oct 2020 10:41:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:41030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762244AbgJ0Olh (ORCPT ); Tue, 27 Oct 2020 10:41:37 -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 28F1121D7B; Tue, 27 Oct 2020 14:41:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603809696; bh=i9pwAcbMBFwVFvTsy6gwZlshudc99nSg7f/5QAsJM/4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xu6osvY092aUMVDMNXp2ekAQvpHVYjQbz5opXO0MwjhXt7QIUVb4xaH05SrhoA1EF hFTEed8T8RSskSbyRC2HIhujg8D9Rmt+tH03uI1G4075xd3qEMYelSgDLzUJFh+EBG aRZdUqAMcz0UE7cHAHSjuZCgduJ0m0iO2shZlyaw= 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 5.4 280/408] vfio/pci: Clear token on bypass registration failure Date: Tue, 27 Oct 2020 14:53:38 +0100 Message-Id: <20201027135508.031315849@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135455.027547757@linuxfoundation.org> References: <20201027135455.027547757@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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 1d9fb25929459..869dce5f134dd 100644 --- a/drivers/vfio/pci/vfio_pci_intrs.c +++ b/drivers/vfio/pci/vfio_pci_intrs.c @@ -352,11 +352,13 @@ 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;