From patchwork Tue Sep 22 16:24:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 1369120 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=N6DyX9Bv; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BwmrX5ymkz9sSt for ; Wed, 23 Sep 2020 02:25:48 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726682AbgIVQZq (ORCPT ); Tue, 22 Sep 2020 12:25:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:52628 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726566AbgIVQZq (ORCPT ); Tue, 22 Sep 2020 12:25:46 -0400 Received: from sol.attlocal.net (172-10-235-113.lightspeed.sntcca.sbcglobal.net [172.10.235.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0173A23A1B; Tue, 22 Sep 2020 16:25:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600791946; bh=TYZYFsETxKQokJa5RQ1ZT+XnfW77zUGnkWfO/996T6c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N6DyX9BvrTxWtntNUaLSrdcUAqIFDIgsKU0dDH2YUBI6/tUe1klJvijggIGn+R6ZV 5DAddRWtDHwZbZY5fRAWkMjfWPUL+19EutKm/M4cYj+ll0P7spobZpu+IgikKPbmrZ XP6/Y4Rbt/ahLXyf2uulWDAOMPSITmkAU+qYq8S0= From: Eric Biggers To: linux-ext4@vger.kernel.org, Theodore Ts'o Cc: syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, syzbot+9f864abad79fae7c17e1@syzkaller.appspotmail.com Subject: [PATCH] ext4: fix leaking sysfs kobject after failed mount Date: Tue, 22 Sep 2020 09:24:56 -0700 Message-Id: <20200922162456.93657-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <000000000000443d8a05afcff2b5@google.com> References: <000000000000443d8a05afcff2b5@google.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Eric Biggers ext4_unregister_sysfs() only deletes the kobject. The reference to it needs to be put separately, like ext4_put_super() does. This addresses the syzbot report "memory leak in kobject_set_name_vargs (3)" (https://syzkaller.appspot.com/bug?extid=9f864abad79fae7c17e1). Reported-by: syzbot+9f864abad79fae7c17e1@syzkaller.appspotmail.com Fixes: 72ba74508b28 ("ext4: release sysfs kobject when failing to enable quotas on mount") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers Reviewed-by: Jan Kara --- fs/ext4/super.c | 1 + 1 file changed, 1 insertion(+) base-commit: ba4f184e126b751d1bffad5897f263108befc780 diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ea425b49b345..41953b86ffe3 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4872,6 +4872,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) failed_mount8: ext4_unregister_sysfs(sb); + kobject_put(&sbi->s_kobj); failed_mount7: ext4_unregister_li_request(sb); failed_mount6: