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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 14284C43603 for ; Fri, 6 Dec 2019 13:49:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D84AE2064B for ; Fri, 6 Dec 2019 13:49:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="LTEJgQ5t" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726234AbfLFNtJ (ORCPT ); Fri, 6 Dec 2019 08:49:09 -0500 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:65230 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726201AbfLFNtJ (ORCPT ); Fri, 6 Dec 2019 08:49:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1575640149; x=1607176149; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=yg/H4rYLdpjMh9EeUO9p3gNSwplJDxuqHR+8symDg3A=; b=LTEJgQ5tm4ht+lT8CsKEFqzJS0qYquI4zxI/w20qqP3SpfM3NV5wRvbh P/A1iDAI6KS00Jsa+VlZP6jQHfehrb1VBeKUKjh+Y+C8Tj3yHcvcxiY1o xsgUI9A+U41WJuh0f2QA6wzD8htECy+JNlj5NGq8zsyMyTEtYII4ET3a8 c=; IronPort-SDR: FjhXB9JqAJI6AnLIvtS0fINmoBUIYUcB+9FSmhw7O7H4zkwx4pPwr7ol9WV7YDYF8GNVE7iwSL 9QljUSXCPItg== X-IronPort-AV: E=Sophos;i="5.69,284,1571702400"; d="scan'208";a="13388569" Received: from sea32-co-svc-lb4-vlan3.sea.corp.amazon.com (HELO email-inbound-relay-2b-c300ac87.us-west-2.amazon.com) ([10.47.23.38]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 06 Dec 2019 13:48:57 +0000 Received: from EX13MTAUEA001.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-c300ac87.us-west-2.amazon.com (Postfix) with ESMTPS id 6334EA2BE3; Fri, 6 Dec 2019 13:48:56 +0000 (UTC) Received: from EX13D07EUB004.ant.amazon.com (10.43.166.234) by EX13MTAUEA001.ant.amazon.com (10.43.61.243) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 6 Dec 2019 13:48:55 +0000 Received: from u86a60e9fba0b55.ant.amazon.com (10.43.162.16) by EX13D07EUB004.ant.amazon.com (10.43.166.234) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 6 Dec 2019 13:48:51 +0000 From: Stefan Nuernberger To: CC: Boris Ostrovsky , Juergen Gross , Ross Lagerwall , Uwe Dannowski , Conny Seidel , Stefan Nuernberger , , Subject: [PATCH] xen/pciback: Prevent NULL pointer dereference in quirks_show Date: Fri, 6 Dec 2019 14:48:04 +0100 Message-ID: <20191206134804.4537-1-snu@amazon.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-Originating-IP: [10.43.162.16] X-ClientProxiedBy: EX13D04UWB004.ant.amazon.com (10.43.161.103) To EX13D07EUB004.ant.amazon.com (10.43.166.234) Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Uwe Dannowski Reading /sys/bus/pci/drivers/pciback/quirks while unbinding can result in dereferencing a NULL pointer. Instead, skip printing information about the dangling quirk. Reported-by: Conny Seidel Signed-off-by: Uwe Dannowski Signed-off-by: Stefan Nuernberger Cc: xen-devel@lists.xenproject.org Cc: stable@vger.kernel.org --- drivers/xen/xen-pciback/pci_stub.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c index 097410a7cdb7..da725e474294 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -1346,6 +1346,8 @@ static ssize_t quirks_show(struct device_driver *drv, char *buf) quirk->devid.subdevice); dev_data = pci_get_drvdata(quirk->pdev); + if (!dev_data) + continue; list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { field = cfg_entry->field; -- 2.23.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879