From patchwork Tue Apr 28 18:23:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 226947 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=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 CA410C83000 for ; Tue, 28 Apr 2020 18:26:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A500A2173E for ; Tue, 28 Apr 2020 18:26:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098395; bh=no3knKj15K/kqw5BYs/rcA1+Ow+Jsr8lPJT0094hSSg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Vp7ZLj3aneZxw4rEDpNg3AwYiLttwAHWIh9f3UfmzwcUMOkw8HhKfwassPYAMUVOd O4IFh3Ahl6lL2wG96tJ/jo2Dh4+yCUR1vMvpQAyfbhODvrnrOF1Bm5AewaCUYgwrfL bmuHY3wgkC0f2A7L0EMJLRXT4jTc5vzjojvWp8eE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728742AbgD1S0e (ORCPT ); Tue, 28 Apr 2020 14:26:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:38088 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728766AbgD1S0d (ORCPT ); Tue, 28 Apr 2020 14:26:33 -0400 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 7199520B1F; Tue, 28 Apr 2020 18:26:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098392; bh=no3knKj15K/kqw5BYs/rcA1+Ow+Jsr8lPJT0094hSSg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PCyNrPNGQDUFSXqq8A4ARcX8W4/AuilgHbO4jjlrbtwu247nuNj7qStqcBM4u0kO2 EmPGVm5QDMqxlb4swYYEtRNqM4J3naaj7XEZscM1AHX9kTKWqcg7d+3Xh02LlZli6h HW6sK6ARkc/Q1SB1vprW3NYw5EwZWpRjIZDqhUmQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vasily Averin , Andrew Morton , Peter Oberparleiter , Al Viro , Davidlohr Bueso , Ingo Molnar , Manfred Spraul , NeilBrown , Steven Rostedt , Waiman Long , Linus Torvalds , Sasha Levin Subject: [PATCH 5.6 021/167] kernel/gcov/fs.c: gcov_seq_next() should increase position index Date: Tue, 28 Apr 2020 20:23:17 +0200 Message-Id: <20200428182227.835883934@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182225.451225420@linuxfoundation.org> References: <20200428182225.451225420@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: Vasily Averin [ Upstream commit f4d74ef6220c1eda0875da30457bef5c7111ab06 ] If seq_file .next function does not change position index, read after some lseek can generate unexpected output. https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin Signed-off-by: Andrew Morton Acked-by: Peter Oberparleiter Cc: Al Viro Cc: Davidlohr Bueso Cc: Ingo Molnar Cc: Manfred Spraul Cc: NeilBrown Cc: Steven Rostedt Cc: Waiman Long Link: http://lkml.kernel.org/r/f65c6ee7-bd00-f910-2f8a-37cc67e4ff88@virtuozzo.com Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- kernel/gcov/fs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c index e5eb5ea7ea598..cc4ee482d3fba 100644 --- a/kernel/gcov/fs.c +++ b/kernel/gcov/fs.c @@ -108,9 +108,9 @@ static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos) { struct gcov_iterator *iter = data; + (*pos)++; if (gcov_iter_next(iter)) return NULL; - (*pos)++; return iter; }