From patchwork Thu Dec 7 10:15:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 845503 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3ysrwW3dwzz9sBd for ; Thu, 7 Dec 2017 21:15:55 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752525AbdLGKPj (ORCPT ); Thu, 7 Dec 2017 05:15:39 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:53038 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752466AbdLGKPZ (ORCPT ); Thu, 7 Dec 2017 05:15:25 -0500 Received: from ayla.of.borg ([84.195.106.246]) by michel.telenet-ops.be with bizsmtp id iyFN1w00s5JzmfG06yFN5Q; Thu, 07 Dec 2017 11:15:24 +0100 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.86_2) (envelope-from ) id 1eMtD8-0007UJ-Mq; Thu, 07 Dec 2017 11:15:22 +0100 Received: from geert by ramsan with local (Exim 4.86_2) (envelope-from ) id 1eMtD8-0001Eo-I8; Thu, 07 Dec 2017 11:15:22 +0100 From: Geert Uytterhoeven To: Simon Horman , Lorenzo Pieralisi , Bjorn Helgaas Cc: Harunobu Kurokawa , Phil Edworthy , linux-pci@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 1/2] PCI: rcar: Fix use-after-free in probe error path Date: Thu, 7 Dec 2017 11:15:19 +0100 Message-Id: <1512641720-4715-2-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1512641720-4715-1-git-send-email-geert+renesas@glider.be> References: <1512641720-4715-1-git-send-email-geert+renesas@glider.be> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If CONFIG_DEBUG_SLAB=y, and no PCIe card is inserted, the kernel crashes during probe on r8a7791/koelsch: rcar-pcie fe000000.pcie: PCIe link down Unable to handle kernel paging request at virtual address 6b6b6b6b (seeing this message requires earlycon and keep_bootcon). Indeed, pci_free_host_bridge() frees the PCI host bridge, including the embedded rcar_pcie object, so pci_free_resource_list() must not be called afterwards. To fix this, move the call to pci_free_resource_list() up, and update the label name accordingly. Fixes: ddd535f1ea3eb27e ("PCI: rcar: Fix memory leak when no PCIe card is inserted") Signed-off-by: Geert Uytterhoeven Acked-by: Lorenzo Pieralisi --- drivers/pci/host/pcie-rcar.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 12796eccb2befd91..52ab3cb0a0bfe065 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -1128,12 +1128,12 @@ static int rcar_pcie_probe(struct platform_device *pdev) err = rcar_pcie_get_resources(pcie); if (err < 0) { dev_err(dev, "failed to request resources: %d\n", err); - goto err_free_bridge; + goto err_free_resource_list; } err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node); if (err) - goto err_free_bridge; + goto err_free_resource_list; pm_runtime_enable(dev); err = pm_runtime_get_sync(dev); @@ -1176,9 +1176,9 @@ static int rcar_pcie_probe(struct platform_device *pdev) err_pm_disable: pm_runtime_disable(dev); -err_free_bridge: - pci_free_host_bridge(bridge); +err_free_resource_list: pci_free_resource_list(&pcie->resources); + pci_free_host_bridge(bridge); return err; }