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=-7.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 4E3ADC67838 for ; Thu, 6 Dec 2018 14:53:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1773520850 for ; Thu, 6 Dec 2018 14:53:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544108017; bh=7PdvY6VK14D/V0mMZ88C1Ed5U84XooBzyNRD5Vgqfi8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qTL6tC47vH6phM+ZFtgQVmcq9QmFD2Q/Vsmrzl9prcBKCo0ocC8aeZSq1N2zn8Y85 7zloioCH7D2C7EbTggw+4EqpuuRbCaQzuDy1lhwm4M8oewDKYvio0BmCB4D0j83X2z m3LemMvwQTkob9gK11oK/JoRIEEok6znZmQ8QoKQ= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1773520850 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731052AbeLFOpY (ORCPT ); Thu, 6 Dec 2018 09:45:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:50064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730539AbeLFOpV (ORCPT ); Thu, 6 Dec 2018 09:45:21 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 3BE302082B; Thu, 6 Dec 2018 14:45:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544107520; bh=7PdvY6VK14D/V0mMZ88C1Ed5U84XooBzyNRD5Vgqfi8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d5hR3+lJabj+U8jF0fjxqOoNzwfr7lhl825ZNpbhgzBICePKXuBgJRPJDhjozvNXX 0JZF4nyyshJurKWT+ovSQqCtmcACwmdBXrWVkdpKJwvJuWp2S17OyEC8wgFmx8Oqka Jp2rlCJiuOiRHydlT0MwiTiaGxMejscZJnmOwJg4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Torvalds Subject: [PATCH 4.9 005/101] unifdef: use memcpy instead of strncpy Date: Thu, 6 Dec 2018 15:38:04 +0100 Message-Id: <20181206143011.928684610@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181206143011.174892052@linuxfoundation.org> References: <20181206143011.174892052@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Linus Torvalds commit 38c7b224ce22c25fed04007839edf974bd13439d upstream. New versions of gcc reasonably warn about the odd pattern of strncpy(p, q, strlen(q)); which really doesn't make sense: the strncpy() ends up being just a slow and odd way to write memcpy() in this case. There was a comment about _why_ the code used strncpy - to avoid the terminating NUL byte, but memcpy does the same and avoids the warning. Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- scripts/unifdef.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/scripts/unifdef.c +++ b/scripts/unifdef.c @@ -395,7 +395,7 @@ usage(void) * When we have processed a group that starts off with a known-false * #if/#elif sequence (which has therefore been deleted) followed by a * #elif that we don't understand and therefore must keep, we edit the - * latter into a #if to keep the nesting correct. We use strncpy() to + * latter into a #if to keep the nesting correct. We use memcpy() to * overwrite the 4 byte token "elif" with "if " without a '\0' byte. * * When we find a true #elif in a group, the following block will @@ -450,7 +450,7 @@ static void Idrop (void) { Fdrop(); ign static void Itrue (void) { Ftrue(); ignoreon(); } static void Ifalse(void) { Ffalse(); ignoreon(); } /* modify this line */ -static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); } +static void Mpass (void) { memcpy(keyword, "if ", 4); Pelif(); } static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); } static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); } static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }