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=-6.8 required=3.0 tests=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 7A4F9C433FF for ; Thu, 8 Aug 2019 19:13:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 457EF214C6 for ; Thu, 8 Aug 2019 19:13:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565291600; bh=Z6vYSwF3i/SL/KjmwyRDEqkFfEj7HtgxLLeYqEI4hMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FMJoFolkTQ/t7AyNtk+0ayIBgqrkZt5M9YlKCkPyCeLECCDQhX0MJroJFuO67/ypb l/EDc0k6M3bBxXKILeAdf8ZZVcPYYwcXdu9DU0M2MQO0FdwC6y77qgIxWDJBZJ7S9y RMOHrLvvyqzgrk9RlEhexASKsKoQm61QyOpwwSFk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405217AbfHHTKD (ORCPT ); Thu, 8 Aug 2019 15:10:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:44346 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405205AbfHHTJ7 (ORCPT ); Thu, 8 Aug 2019 15:09:59 -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 012662173E; Thu, 8 Aug 2019 19:09:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565291398; bh=Z6vYSwF3i/SL/KjmwyRDEqkFfEj7HtgxLLeYqEI4hMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ehbd1ONi0QobQSk+QR18pk7CfP07aSpmWI+Rk+SK6b1Lfo0OhXOpQmEgkW6VqINJ+ SFTsX3/Sa0Kwkv0x5E6X6TR0GjXDe68gBYeTtjARGJ5Y0QNa+4melmh8iuGRUNhFYc iwhvZfGthXKxpjg1g6LEkA95WV3dY0Fxd/sdMfB0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tejun Heo , syzbot+d4bba5ccd4f9a2a68681@syzkaller.appspotmail.com Subject: [PATCH 4.19 44/45] cgroup: Fix css_task_iter_advance_css_set() cset skip condition Date: Thu, 8 Aug 2019 21:05:30 +0200 Message-Id: <20190808190456.379808712@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190808190453.827571908@linuxfoundation.org> References: <20190808190453.827571908@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: Tejun Heo commit c596687a008b579c503afb7a64fcacc7270fae9e upstream. While adding handling for dying task group leaders c03cd7738a83 ("cgroup: Include dying leaders with live threads in PROCS iterations") added an inverted cset skip condition to css_task_iter_advance_css_set(). It should skip cset if it's completely empty but was incorrectly testing for the inverse condition for the dying_tasks list. Fix it. Signed-off-by: Tejun Heo Fixes: c03cd7738a83 ("cgroup: Include dying leaders with live threads in PROCS iterations") Reported-by: syzbot+d4bba5ccd4f9a2a68681@syzkaller.appspotmail.com Signed-off-by: Greg Kroah-Hartman --- kernel/cgroup/cgroup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -4154,7 +4154,7 @@ static void css_task_iter_advance_css_se it->task_pos = NULL; return; } - } while (!css_set_populated(cset) && !list_empty(&cset->dying_tasks)); + } while (!css_set_populated(cset) && list_empty(&cset->dying_tasks)); if (!list_empty(&cset->tasks)) it->task_pos = cset->tasks.next;