linux-kernel - [PATCH 3.16.y-ckt 083/133] hfs: fix B-tree corruption after insertion at position 0

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Message-Id: <1443606681-7124-84-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 30 Sep 2015 10:50:31 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Hin-Tak Leung <htl10@...rs.sourceforge.net>,
	Sergei Antonov <saproj@...il.com>,
	Joe Perches <joe@...ches.com>,
	Anton Altaparmakov <anton@...era.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 083/133] hfs: fix B-tree corruption after insertion at position 0

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hin-Tak Leung <htl10@...rs.sourceforge.net>

commit b4cc0efea4f0bfa2477c56af406cfcf3d3e58680 upstream.

Fix B-tree corruption when a new record is inserted at position 0 in the
node in hfs_brec_insert().

This is an identical change to the corresponding hfs b-tree code to Sergei
Antonov's "hfsplus: fix B-tree corruption after insertion at position 0",
to keep similar code paths in the hfs and hfsplus drivers in sync, where
appropriate.

Signed-off-by: Hin-Tak Leung <htl10@...rs.sourceforge.net>
Cc: Sergei Antonov <saproj@...il.com>
Cc: Joe Perches <joe@...ches.com>
Reviewed-by: Vyacheslav Dubeyko <slava@...eyko.com>
Cc: Anton Altaparmakov <anton@...era.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/hfs/brec.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/fs/hfs/brec.c b/fs/hfs/brec.c
index 9f4ee7f52026..6fc766df0461 100644
--- a/fs/hfs/brec.c
+++ b/fs/hfs/brec.c
@@ -131,13 +131,16 @@ skip:
 	hfs_bnode_write(node, entry, data_off + key_len, entry_len);
 	hfs_bnode_dump(node);
 
-	if (new_node) {
-		/* update parent key if we inserted a key
-		 * at the start of the first node
-		 */
-		if (!rec && new_node != node)
-			hfs_brec_update_parent(fd);
+	/*
+	 * update parent key if we inserted a key
+	 * at the start of the node and it is not the new node
+	 */
+	if (!rec && new_node != node) {
+		hfs_bnode_read_key(node, fd->search_key, data_off + size);
+		hfs_brec_update_parent(fd);
+	}
 
+	if (new_node) {
 		hfs_bnode_put(fd->bnode);
 		if (!new_node->parent) {
 			hfs_btree_inc_height(tree);
@@ -166,9 +169,6 @@ skip:
 		goto again;
 	}
 
-	if (!rec)
-		hfs_brec_update_parent(fd);
-
 	return 0;
 }
 
@@ -366,6 +366,8 @@ again:
 	if (IS_ERR(parent))
 		return PTR_ERR(parent);
 	__hfs_brec_find(parent, fd);
+	if (fd->record < 0)
+		return -ENOENT;
 	hfs_bnode_dump(parent);
 	rec = fd->record;
 
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