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=-10.1 required=3.0 tests=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=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 AA51FC2BA19 for ; Wed, 15 Apr 2020 12:36:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E5A72074F for ; Wed, 15 Apr 2020 12:36:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586954172; bh=W8o+PisOtU2oX7Zz9Q/BVrsKAC2DBRGXAIHr24EMmzs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=oFBkT5r5BlUfldcFAMMmmpKfnPAN+UI0Ub08lXHDn25WHvdivS2n701msXZyi8g2z Lvyb514ruoQh45NdKpACQTAOa/IBIyjUIWFWQGp62R2NGw5oKJ0gDlpKd0ig2so8nA X2sKYEZFbfXJQh+mSLrxkQausRzFv/qYKZib2M80= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S369754AbgDOMeZ (ORCPT ); Wed, 15 Apr 2020 08:34:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:36578 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409068AbgDOLoP (ORCPT ); Wed, 15 Apr 2020 07:44:15 -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 B062520775; Wed, 15 Apr 2020 11:44:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586951054; bh=W8o+PisOtU2oX7Zz9Q/BVrsKAC2DBRGXAIHr24EMmzs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YyV7JR1zdN1BWd2WGnLhQW1Q/OvCZo/oCqk2l9lBFCeR5UiKjAK/8pHgblbGlhmrz ZFcMiC96973KocXv7in9sYCECeYWhVKDSo0rV9AlOUDgIQ4LwyNnGs4hgANmGwk/vu 3nrUN5bXkH9Ucc8heIRH/r3KxmdKtJH4PZ3ZzPhE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jean-Philippe Brucker , Eric Auger , Robin Murphy , Joerg Roedel , Sasha Levin , virtualization@lists.linux-foundation.org, iommu@lists.linux-foundation.org Subject: [PATCH AUTOSEL 5.5 088/106] iommu/virtio: Fix freeing of incomplete domains Date: Wed, 15 Apr 2020 07:42:08 -0400 Message-Id: <20200415114226.13103-88-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200415114226.13103-1-sashal@kernel.org> References: <20200415114226.13103-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jean-Philippe Brucker [ Upstream commit 7062af3ed2ba451029e3733d9f677c68f5ea9e77 ] Calling viommu_domain_free() on a domain that hasn't been finalised (not attached to any device, for example) can currently cause an Oops, because we attempt to call ida_free() on ID 0, which may either be unallocated or used by another domain. Only initialise the vdomain->viommu pointer, which denotes a finalised domain, at the end of a successful viommu_domain_finalise(). Fixes: edcd69ab9a32 ("iommu: Add virtio-iommu driver") Reported-by: Eric Auger Signed-off-by: Jean-Philippe Brucker Reviewed-by: Robin Murphy Link: https://lore.kernel.org/r/20200326093558.2641019-3-jean-philippe@linaro.org Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/virtio-iommu.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 315c7cc4f99d8..779a6025b5962 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -613,18 +613,20 @@ static int viommu_domain_finalise(struct viommu_dev *viommu, int ret; struct viommu_domain *vdomain = to_viommu_domain(domain); - vdomain->viommu = viommu; - vdomain->map_flags = viommu->map_flags; + ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain, + viommu->last_domain, GFP_KERNEL); + if (ret < 0) + return ret; + + vdomain->id = (unsigned int)ret; domain->pgsize_bitmap = viommu->pgsize_bitmap; domain->geometry = viommu->geometry; - ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain, - viommu->last_domain, GFP_KERNEL); - if (ret >= 0) - vdomain->id = (unsigned int)ret; + vdomain->map_flags = viommu->map_flags; + vdomain->viommu = viommu; - return ret > 0 ? 0 : ret; + return 0; } static void viommu_domain_free(struct iommu_domain *domain) -- 2.20.1