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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 D35A8C3F2CE for ; Tue, 17 Mar 2020 11:12:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A661A205ED for ; Tue, 17 Mar 2020 11:12:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584443553; bh=KfkoEY+Syfax/L/wRug3QqCGe34zw6kA5NHS4T9pyJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IPq+tN0QIXkE7GUpfMbK/Mi4N5DxNn4EAgh62rNfOfPwInVzorg4z5NtnqtIaSqgB m7IuvdCNJCIAj6dCES7qfJtL8Z9T5DDGwDyALeH4UgN/PzINOeI0E5yJL5j0Fkw/TX HIwKPDrxIKiBnZ7V/uQqgGk8ttma9RAaosUI0mLw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729425AbgCQLMc (ORCPT ); Tue, 17 Mar 2020 07:12:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:56164 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729130AbgCQLM3 (ORCPT ); Tue, 17 Mar 2020 07:12:29 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 4FF9C20719; Tue, 17 Mar 2020 11:12:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584443548; bh=KfkoEY+Syfax/L/wRug3QqCGe34zw6kA5NHS4T9pyJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CLZzI6CMcNvkwZK/9isX+6RKgGVIRdML6O+acKk7RDKIBO+1EcQSUM6ft6dz6vBWQ ICosKqdkE8DM5RGHrqvAtSOCW70copRaj9HuB0A79dV0lgHhwTep0KsqyMZ5aQaO+o B5dr4hYckunwySjMkgVNtpRevr76o1iWpnZbNV9c= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Zyngier , Eric Auger , Robin Murphy , Joerg Roedel , Will Deacon Subject: [PATCH 5.5 119/151] iommu/dma: Fix MSI reservation allocation Date: Tue, 17 Mar 2020 11:55:29 +0100 Message-Id: <20200317103334.923709728@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200317103326.593639086@linuxfoundation.org> References: <20200317103326.593639086@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marc Zyngier commit 65ac74f1de3334852fb7d9b1b430fa5a06524276 upstream. The way cookie_init_hw_msi_region() allocates the iommu_dma_msi_page structures doesn't match the way iommu_put_dma_cookie() frees them. The former performs a single allocation of all the required structures, while the latter tries to free them one at a time. It doesn't quite work for the main use case (the GICv3 ITS where the range is 64kB) when the base granule size is 4kB. This leads to a nice slab corruption on teardown, which is easily observable by simply creating a VF on a SRIOV-capable device, and tearing it down immediately (no need to even make use of it). Fortunately, this only affects systems where the ITS isn't translated by the SMMU, which are both rare and non-standard. Fix it by allocating iommu_dma_msi_page structures one at a time. Fixes: 7c1b058c8b5a3 ("iommu/dma: Handle IOMMU API reserved regions") Signed-off-by: Marc Zyngier Reviewed-by: Eric Auger Cc: Robin Murphy Cc: Joerg Roedel Cc: Will Deacon Cc: stable@vger.kernel.org Reviewed-by: Robin Murphy Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/dma-iommu.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -177,15 +177,15 @@ static int cookie_init_hw_msi_region(str start -= iova_offset(iovad, start); num_pages = iova_align(iovad, end - start) >> iova_shift(iovad); - msi_page = kcalloc(num_pages, sizeof(*msi_page), GFP_KERNEL); - if (!msi_page) - return -ENOMEM; - for (i = 0; i < num_pages; i++) { - msi_page[i].phys = start; - msi_page[i].iova = start; - INIT_LIST_HEAD(&msi_page[i].list); - list_add(&msi_page[i].list, &cookie->msi_page_list); + msi_page = kmalloc(sizeof(*msi_page), GFP_KERNEL); + if (!msi_page) + return -ENOMEM; + + msi_page->phys = start; + msi_page->iova = start; + INIT_LIST_HEAD(&msi_page->list); + list_add(&msi_page->list, &cookie->msi_page_list); start += iovad->granule; }