linux-kernel - [PATCH 3.10 085/180] ext4: check for extents that wrap around

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Message-Id: <1471793510-13022-86-git-send-email-w@1wt.eu>
Date:   Sun, 21 Aug 2016 17:30:15 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vegard Nossum <vegard.nossum@...cle.com>,
        Eryu Guan <guaneryu@...il.com>,
        Phil Turnbull <phil.turnbull@...cle.com>,
        "Theodore Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 085/180] ext4: check for extents that wrap around

From: Vegard Nossum <vegard.nossum@...cle.com>

commit f70749ca42943faa4d4dcce46dfdcaadb1d0c4b6 upstream.

An extent with lblock = 4294967295 and len = 1 will pass the
ext4_valid_extent() test:

	ext4_lblk_t last = lblock + len - 1;

	if (len == 0 || lblock > last)
		return 0;

since last = 4294967295 + 1 - 1 = 4294967295. This would later trigger
the BUG_ON(es->es_lblk + es->es_len < es->es_lblk) in ext4_es_end().

We can simplify it by removing the - 1 altogether and changing the test
to use lblock + len <= lblock, since now if len = 0, then lblock + 0 ==
lblock and it fails, and if len > 0 then lblock + len > lblock in order
to pass (i.e. it doesn't overflow).

Fixes: 5946d0893 ("ext4: check for overlapping extents in ext4_valid_extent_entries()")
Fixes: 2f974865f ("ext4: check for zero length extent explicitly")
Cc: Eryu Guan <guaneryu@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Willy Tarreau <w@....eu>
---
 fs/ext4/extents.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f9fe359..7eea761 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -361,9 +361,13 @@ static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
 	ext4_fsblk_t block = ext4_ext_pblock(ext);
 	int len = ext4_ext_get_actual_len(ext);
 	ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
-	ext4_lblk_t last = lblock + len - 1;
 
-	if (len == 0 || lblock > last)
+	/*
+	 * We allow neither:
+	 *  - zero length
+	 *  - overflow/wrap-around
+	 */
+	if (lblock + len <= lblock)
 		return 0;
 	return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
 }
-- 
2.8.0.rc2.1.gbe9624a