From patchwork Thu Dec 14 13:01:46 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 10111985 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6D11C60352 for ; Thu, 14 Dec 2017 13:02:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5C6AD29B42 for ; Thu, 14 Dec 2017 13:02:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8827129C2B; Thu, 14 Dec 2017 13:02:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3965329B42 for ; Thu, 14 Dec 2017 13:02:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752509AbdLNNCS (ORCPT ); Thu, 14 Dec 2017 08:02:18 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:59013 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752033AbdLNNCR (ORCPT ); Thu, 14 Dec 2017 08:02:17 -0500 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id C6C381841C; Thu, 14 Dec 2017 14:02:15 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at bastet.se.axis.com Received: from bastet.se.axis.com ([IPv6:::ffff:127.0.0.1]) by localhost (bastet.se.axis.com [::ffff:127.0.0.1]) (amavisd-new, port 10024) with LMTP id 2foJUuhRPwwr; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: from boulder03.se.axis.com (boulder03.se.axis.com [10.0.8.17]) by bastet.se.axis.com (Postfix) with ESMTPS id 4217B18414; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2CCDC1E091; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1E5D91E090; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: from seth.se.axis.com (unknown [10.0.2.172]) by boulder03.se.axis.com (Postfix) with ESMTP; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: from lnxartpec1.se.axis.com (lnxartpec1.se.axis.com [10.88.4.10]) by seth.se.axis.com (Postfix) with ESMTP id 1263F10E; Thu, 14 Dec 2017 14:02:15 +0100 (CET) Received: by lnxartpec1.se.axis.com (Postfix, from userid 20283) id 0D5EC401A4; Thu, 14 Dec 2017 14:02:14 +0100 (CET) From: Niklas Cassel To: Kishon Vijay Abraham I , Lorenzo Pieralisi , Bjorn Helgaas Cc: Niklas Cassel , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 3/3] PCI: endpoint: Fix find_first_zero_bit() usage Date: Thu, 14 Dec 2017 14:01:46 +0100 Message-Id: <20171214130147.1790-4-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171214130147.1790-1-niklas.cassel@axis.com> References: <20171214130147.1790-1-niklas.cassel@axis.com> X-TM-AS-GCONF: 00 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP find_first_zero_bit()'s parameter 'size' is defined in bits, not in bytes. Calling find_first_zero_bit() with the wrong size unit will lead to insidious bugs. Fix this by calling find_first_zero_bit() with size BITS_PER_LONG, rather than sizeof() and add missing find_first_zero_bit() return handling. Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions") Signed-off-by: Niklas Cassel Acked-by: Kishon Vijay Abraham I --- drivers/pci/endpoint/pci-ep-cfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c index e8f65eb51c1a..c9a2fb9dd49d 100644 --- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -103,7 +103,10 @@ static int pci_epc_epf_link(struct config_item *epc_item, struct pci_epf *epf = epf_group->epf; func_no = find_first_zero_bit(&epc_group->function_num_map, - sizeof(epc_group->function_num_map)); + BITS_PER_LONG); + if (func_no >= BITS_PER_LONG) + return -EINVAL; + set_bit(func_no, &epc_group->function_num_map); epf->func_no = func_no;