From patchwork Wed Jan 22 09:29:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 233460 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, 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 09B2BC33CAF for ; Wed, 22 Jan 2020 09:55:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4E5A2467B for ; Wed, 22 Jan 2020 09:55:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579686952; bh=oF1Vd0LhvbDGRClAC3BFqvWOM1Wrvqh27WydgE6GlvU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tQHm7ibaPsO8ubvtza9ALB75adHRUNGFnJRbYmen5L1Hd4fOhuXE2A7nhVQk76M/B v2mZcX0TdHzWAZfqIHY11BysP503b/qNrGIJ4cdWz67ssHBycZrN2L6aB/wgz0cR9t fH67j/NiNRTE4at+ReGmwugSH+LtoEbjkC8IwowE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730117AbgAVJcc (ORCPT ); Wed, 22 Jan 2020 04:32:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:45434 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730126AbgAVJcb (ORCPT ); Wed, 22 Jan 2020 04:32:31 -0500 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 BDEBD24672; Wed, 22 Jan 2020 09:32:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579685550; bh=oF1Vd0LhvbDGRClAC3BFqvWOM1Wrvqh27WydgE6GlvU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZNvAXD6Zjlohn8bapG4ByVhAafI/slWN4LXQG7ribtg8VQFhPD2O+BNoetIKsjsBn V1vt3Vv3M8MWQcKXrz6eTb8ZAEikY5Hrl9Fe/xYgAsAsz/KgIuLYTX40OnCIjm0Yyl KaRjPhdD/V4gN6iptuTy5AwLjR7t+yPC07AkB0rU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.4 59/76] scsi: fnic: fix invalid stack access Date: Wed, 22 Jan 2020 10:29:15 +0100 Message-Id: <20200122092759.957956924@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200122092751.587775548@linuxfoundation.org> References: <20200122092751.587775548@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arnd Bergmann [ Upstream commit 42ec15ceaea74b5f7a621fc6686cbf69ca66c4cf ] gcc -O3 warns that some local variables are not properly initialized: drivers/scsi/fnic/vnic_dev.c: In function 'fnic_dev_hang_notify': drivers/scsi/fnic/vnic_dev.c:511:16: error: 'a0' is used uninitialized in this function [-Werror=uninitialized] vdev->args[0] = *a0; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:691:6: note: 'a0' was declared here u64 a0, a1; ^~ drivers/scsi/fnic/vnic_dev.c:512:16: error: 'a1' is used uninitialized in this function [-Werror=uninitialized] vdev->args[1] = *a1; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:691:10: note: 'a1' was declared here u64 a0, a1; ^~ drivers/scsi/fnic/vnic_dev.c: In function 'fnic_dev_mac_addr': drivers/scsi/fnic/vnic_dev.c:512:16: error: 'a1' is used uninitialized in this function [-Werror=uninitialized] vdev->args[1] = *a1; ~~~~~~~~~~~~~~^~~~~ drivers/scsi/fnic/vnic_dev.c:698:10: note: 'a1' was declared here u64 a0, a1; ^~ Apparently the code relies on the local variables occupying adjacent memory locations in the same order, but this is of course not guaranteed. Use an array of two u64 variables where needed to make it work correctly. I suspect there is also an endianness bug here, but have not digged in deep enough to be sure. Fixes: 5df6d737dd4b ("[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA") Fixes: mmtom ("init/Kconfig: enable -O3 for all arches") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200107201602.4096790-1-arnd@arndb.de Signed-off-by: Arnd Bergmann Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/fnic/vnic_dev.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/fnic/vnic_dev.c b/drivers/scsi/fnic/vnic_dev.c index ba69d6112fa1..c5b89a003d2a 100644 --- a/drivers/scsi/fnic/vnic_dev.c +++ b/drivers/scsi/fnic/vnic_dev.c @@ -445,26 +445,26 @@ int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done) int vnic_dev_hang_notify(struct vnic_dev *vdev) { - u64 a0, a1; + u64 a0 = 0, a1 = 0; int wait = 1000; return vnic_dev_cmd(vdev, CMD_HANG_NOTIFY, &a0, &a1, wait); } int vnic_dev_mac_addr(struct vnic_dev *vdev, u8 *mac_addr) { - u64 a0, a1; + u64 a[2] = {}; int wait = 1000; int err, i; for (i = 0; i < ETH_ALEN; i++) mac_addr[i] = 0; - err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a0, &a1, wait); + err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a[0], &a[1], wait); if (err) return err; for (i = 0; i < ETH_ALEN; i++) - mac_addr[i] = ((u8 *)&a0)[i]; + mac_addr[i] = ((u8 *)&a)[i]; return 0; } @@ -489,30 +489,30 @@ void vnic_dev_packet_filter(struct vnic_dev *vdev, int directed, int multicast, void vnic_dev_add_addr(struct vnic_dev *vdev, u8 *addr) { - u64 a0 = 0, a1 = 0; + u64 a[2] = {}; int wait = 1000; int err; int i; for (i = 0; i < ETH_ALEN; i++) - ((u8 *)&a0)[i] = addr[i]; + ((u8 *)&a)[i] = addr[i]; - err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait); + err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a[0], &a[1], wait); if (err) pr_err("Can't add addr [%pM], %d\n", addr, err); } void vnic_dev_del_addr(struct vnic_dev *vdev, u8 *addr) { - u64 a0 = 0, a1 = 0; + u64 a[2] = {}; int wait = 1000; int err; int i; for (i = 0; i < ETH_ALEN; i++) - ((u8 *)&a0)[i] = addr[i]; + ((u8 *)&a)[i] = addr[i]; - err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a0, &a1, wait); + err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a[0], &a[1], wait); if (err) pr_err("Can't del addr [%pM], %d\n", addr, err); }