From patchwork Fri May 1 13:21:08 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: 226482 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 B3F6AC47254 for ; Fri, 1 May 2020 13:59:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89767206D6 for ; Fri, 1 May 2020 13:59:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588341588; bh=kn3vplV2Ajsfs0kgxnWd05XDF0uaf40IGq6aiy9WXAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BhSM0tlte4SCgimIM7Ty4IeduP1TLgzK5QgJP36KLwjTGw/FWVKwNuJd8c+a/3gDw bxTZukS6p/dYJEboNHBGMk64yuDm/c6fklqCKQ1RQZ6S9B8+XA5MiqXa0x9qJd8HDO M8qrSnGQNfhBeW8XLnRzLfqnH6Lf860/liQZg5Tg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729083AbgEAN2X (ORCPT ); Fri, 1 May 2020 09:28:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:51360 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729604AbgEAN2W (ORCPT ); Fri, 1 May 2020 09:28:22 -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 8B5AD216FD; Fri, 1 May 2020 13:28:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339702; bh=kn3vplV2Ajsfs0kgxnWd05XDF0uaf40IGq6aiy9WXAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rMUS2SO5fmz5DRAvNa6D2Ym/69PlwGPFZmFmGxYx35/P8muWMTUFOPBa7YgR3uTSG ZsvAowcWDQJQ9wdINIzcW+1zohWZW/S88U1HYyKyjKWdEI2lisXMdINAOVT9tkQWNx +yNHgFLjtsVhMLJR8EgC1J1XUG9FJ9kQ2WutzUi0= 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 4.9 14/80] kernel/gcov/fs.c: gcov_seq_next() should increase position index Date: Fri, 1 May 2020 15:21:08 +0200 Message-Id: <20200501131518.274814134@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131513.810761598@linuxfoundation.org> References: <20200501131513.810761598@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 edf67c493a8e1..e473f6a1f6ca7 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; }