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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 ED1B7C67839 for ; Fri, 14 Dec 2018 12:20:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF835208E7 for ; Fri, 14 Dec 2018 12:20:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544790014; bh=tXLjY+AKxCW+dVyDb+FYlAK+X+BpQhZPadCDXcE1svc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zdhWn2pEFHr8XFUvXBoJ+dc1pdNOPggUEUfcyD8mkbs455yGTkVpk826BBa/UZjOA j8TuLdBPDKFgC5HoWE1XQsdb4ZELCtuSo2YZrtzFNTQJOHYDo/L1o5BDvbsOnS3Mie mMKCkh8rPL7OaJk4kA/VZE1SNTYm135WN/QPDbMo= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AF835208E7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732699AbeLNMUI (ORCPT ); Fri, 14 Dec 2018 07:20:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:35550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732585AbeLNMPd (ORCPT ); Fri, 14 Dec 2018 07:15:33 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 78CD12133F; Fri, 14 Dec 2018 12:15:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544789732; bh=tXLjY+AKxCW+dVyDb+FYlAK+X+BpQhZPadCDXcE1svc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lv+oWljodW9Ks105sISZQGTrwRHaVUA9eZU/K5dnJpbKcUGVjhN7ctHlmIYAPtdu2 by2N8/U0bTnftA2GWCPbytN5fNHu+IeRJLwy9g2zwA7X3D1/nxSNtKy33DJyfF7hv1 BYLYkplJszlfP54scJp2zTqxgihQfmJ/ho/7PKL8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pan Bian , Andrew Morton , "Ernesto A. Fernandez" , Joe Perches , Viacheslav Dubeyko , Linus Torvalds , Sasha Levin Subject: [PATCH 4.4 36/88] hfsplus: do not free node before using Date: Fri, 14 Dec 2018 13:00:10 +0100 Message-Id: <20181214115705.130793524@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181214115702.151309521@linuxfoundation.org> References: <20181214115702.151309521@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit c7d7d620dcbd2a1c595092280ca943f2fced7bbd ] hfs_bmap_free() frees node via hfs_bnode_put(node). However it then reads node->this when dumping error message on an error path, which may result in a use-after-free bug. This patch frees node only when it is never used. Link: http://lkml.kernel.org/r/1543053441-66942-1-git-send-email-bianpan2016@163.com Signed-off-by: Pan Bian Reviewed-by: Andrew Morton Cc: Ernesto A. Fernandez Cc: Joe Perches Cc: Viacheslav Dubeyko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/hfsplus/btree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c index 3345c7553edc..7adc8a327e03 100644 --- a/fs/hfsplus/btree.c +++ b/fs/hfsplus/btree.c @@ -453,14 +453,15 @@ void hfs_bmap_free(struct hfs_bnode *node) nidx -= len * 8; i = node->next; - hfs_bnode_put(node); if (!i) { /* panic */; pr_crit("unable to free bnode %u. " "bmap not found!\n", node->this); + hfs_bnode_put(node); return; } + hfs_bnode_put(node); node = hfs_bnode_find(tree, i); if (IS_ERR(node)) return; -- 2.19.1