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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 13A30C43461 for ; Fri, 11 Sep 2020 13:35:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C573F207EA for ; Fri, 11 Sep 2020 13:35:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599831354; bh=9uwE+ITSYJUhaz4LYB9tyUx6FK+SJeFumGR2VZPPQSc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JgcDLSE9GnhBkGwyKyOlQrSRQeeQpf0zOaFG1N1wVuKuOTdvYMDrDSXl+Fa92RoN4 wNYElLZnaIk5xE/Rt7FLWhzwsBiU33mwMBzYM3OnW+symBWivCt8rSWNBCAZfTyXQq WI9nTkfVhc9puF4W3BvTffTUPZUCW6z4bu2LzSJE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725837AbgIKNeh (ORCPT ); Fri, 11 Sep 2020 09:34:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:52786 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726206AbgIKNFo (ORCPT ); Fri, 11 Sep 2020 09:05:44 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 8AFB0221E3; Fri, 11 Sep 2020 12:58:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599829082; bh=9uwE+ITSYJUhaz4LYB9tyUx6FK+SJeFumGR2VZPPQSc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eKqb5AemMh1gTh+r5FfZEXIvSDR5D+KWXOo3yUrCyTvQpXDjcpObP4qC9NqQZwzZX m9qqIFiKmrW+lgdqb1wVr79jtfbT7GNlFMxCrdSMS/x6lh2JDYC8tsxEuQN/inw0pN 4ZeJN0tkP5AY72Wnuma2CK0xdhbFNidNxhR5f/wI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mrinal Pandey , Andrew Morton , Lukas Bulwahn , Joe Perches , Linus Torvalds Subject: [PATCH 4.9 59/71] checkpatch: fix the usage of capture group ( ... ) Date: Fri, 11 Sep 2020 14:46:43 +0200 Message-Id: <20200911122507.856174623@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200911122504.928931589@linuxfoundation.org> References: <20200911122504.928931589@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Mrinal Pandey commit 13e45417cedbfc44b1926124b1846f5ee8c6ba4a upstream. The usage of "capture group (...)" in the immediate condition after `&&` results in `$1` being uninitialized. This issues a warning "Use of uninitialized value $1 in regexp compilation at ./scripts/checkpatch.pl line 2638". I noticed this bug while running checkpatch on the set of commits from v5.7 to v5.8-rc1 of the kernel on the commits with a diff content in their commit message. This bug was introduced in the script by commit e518e9a59ec3 ("checkpatch: emit an error when there's a diff in a changelog"). It has been in the script since then. The author intended to store the match made by capture group in variable `$1`. This should have contained the name of the file as `[\w/]+` matched. However, this couldn't be accomplished due to usage of capture group and `$1` in the same regular expression. Fix this by placing the capture group in the condition before `&&`. Thus, `$1` can be initialized to the text that capture group matches thereby setting it to the desired and required value. Fixes: e518e9a59ec3 ("checkpatch: emit an error when there's a diff in a changelog") Signed-off-by: Mrinal Pandey Signed-off-by: Andrew Morton Tested-by: Lukas Bulwahn Reviewed-by: Lukas Bulwahn Cc: Joe Perches Link: https://lkml.kernel.org/r/20200714032352.f476hanaj2dlmiot@mrinalpandey Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- scripts/checkpatch.pl | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2375,8 +2375,8 @@ sub process { # Check if the commit log has what seems like a diff which can confuse patch if ($in_commit_log && !$commit_log_has_diff && - (($line =~ m@^\s+diff\b.*a/[\w/]+@ && - $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) || + (($line =~ m@^\s+diff\b.*a/([\w/]+)@ && + $line =~ m@^\s+diff\b.*a/[\w/]+\s+b/$1\b@) || $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ || $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) { ERROR("DIFF_IN_COMMIT_MSG",