From patchwork Tue Dec 12 14:16:34 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 847517 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 3yx22p587wz9s83 for ; Wed, 13 Dec 2017 01:17:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751799AbdLLORG (ORCPT ); Tue, 12 Dec 2017 09:17:06 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:56156 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751503AbdLLORD (ORCPT ); Tue, 12 Dec 2017 09:17:03 -0500 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id 77AFE182D1; Tue, 12 Dec 2017 15:17:02 +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 nVz3pqcDzeQv; Tue, 12 Dec 2017 15:17:01 +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 859C018398; Tue, 12 Dec 2017 15:17:01 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 73F2E1E083; Tue, 12 Dec 2017 15:17:01 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 682EA1E082; Tue, 12 Dec 2017 15:17:01 +0100 (CET) Received: from seth.se.axis.com (unknown [10.0.2.172]) by boulder03.se.axis.com (Postfix) with ESMTP; Tue, 12 Dec 2017 15:17:01 +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 5B272493; Tue, 12 Dec 2017 15:17:01 +0100 (CET) Received: by lnxartpec1.se.axis.com (Postfix, from userid 20283) id 57462401A4; Tue, 12 Dec 2017 15:17:01 +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 v4 3/3] PCI: endpoint: Fix find_first_zero_bit() usage Date: Tue, 12 Dec 2017 15:16:34 +0100 Message-Id: <20171212141634.5985-4-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171212141634.5985-1-niklas.cassel@axis.com> References: <20171212141634.5985-1-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 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: Lorenzo Pieralisi --- drivers/pci/endpoint/pci-ep-cfs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c index e1f5adc9e113..f5ccd1aa2963 100644 --- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -109,7 +109,11 @@ static int pci_epc_epf_link(struct config_item *epc_item, return ret; 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) { + ret = -EINVAL; + goto err_func_no; + } set_bit(func_no, &epc_group->function_num_map); epf->func_no = func_no; @@ -121,6 +125,7 @@ static int pci_epc_epf_link(struct config_item *epc_item, err_epf_bind: clear_bit(func_no, &epc_group->function_num_map); +err_func_no: pci_epc_remove_epf(epc, epf); return ret;