From patchwork Wed Dec 5 09:51:28 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 10713597 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C98771057 for ; Wed, 5 Dec 2018 09:54:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B85D72CCFA for ; Wed, 5 Dec 2018 09:54:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ABF512CD00; Wed, 5 Dec 2018 09:54:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3F0482CCFA for ; Wed, 5 Dec 2018 09:54:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730102AbeLEJyP (ORCPT ); Wed, 5 Dec 2018 04:54:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:60932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729286AbeLEJyO (ORCPT ); Wed, 5 Dec 2018 04:54:14 -0500 Received: from sasha-vm.mshome.net (unknown [213.57.143.11]) (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 4ADAF20661; Wed, 5 Dec 2018 09:54:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544003653; bh=0vGCPPmrdtOTpcqpMGDJjFcNb7U8CA7Daz2O2E7tJZw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QoS5fidgCTC6q6OLWdcMlTzbDfNW13PMcFIhRJNNCVx+nJgRmXKQADudYCqqDqMRy ZEAh7mGVA1MPi2GB6Sy1ToEZtWBwjuBEnOVWMhdl3pOj0ZBcbEJSetASbsxEgC/HHR ICwqij3oVZty6MRQX39diTNL5nG0/+0F6BWRbrAk= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Pan Bian , Joe Perches , "Ernesto A . Fernandez" , Viacheslav Dubeyko , Andrew Morton , Linus Torvalds , Sasha Levin , linux-fsdevel@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 30/33] hfs: do not free node before using Date: Wed, 5 Dec 2018 04:51:28 -0500 Message-Id: <20181205095131.7685-30-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181205095131.7685-1-sashal@kernel.org> References: <20181205095131.7685-1-sashal@kernel.org> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Pan Bian [ Upstream commit ce96a407adef126870b3f4a1b73529dd8aa80f49 ] hfs_bmap_free() frees the 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 the node only when it is never again used. Link: http://lkml.kernel.org/r/1542963889-128825-1-git-send-email-bianpan2016@163.com Fixes: a1185ffa2fc ("HFS rewrite") Signed-off-by: Pan Bian Reviewed-by: Andrew Morton Cc: Joe Perches Cc: Ernesto A. Fernandez Cc: Viacheslav Dubeyko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/hfs/btree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/hfs/btree.c b/fs/hfs/btree.c index 1ab19e660e69..1ff5774a5382 100644 --- a/fs/hfs/btree.c +++ b/fs/hfs/btree.c @@ -328,13 +328,14 @@ 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;