linux-kernel - [PATCH 3.4 096/146] ext4: check for zero length extent explicitly

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Date:	Tue, 15 Sep 2015 17:03:31 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Eryu Guan <guaneryu@...il.com>,
	Theodore Ts'o <tytso@....edu>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 096/146] ext4: check for zero length extent explicitly

From: Eryu Guan <guaneryu@...il.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 2f974865ffdfe7b9f46a9940836c8b167342563d upstream.

The following commit introduced a bug when checking for zero length extent

5946d08 ext4: check for overlapping extents in ext4_valid_extent_entries()

Zero length extent could pass the check if lblock is zero.

Adding the explicit check for zero length back.

Signed-off-by: Eryu Guan <guaneryu@...il.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/ext4/extents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index bb72833..bbe09a9 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -320,7 +320,7 @@ static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
 	ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
 	ext4_lblk_t last = lblock + len - 1;
 
-	if (lblock > last)
+	if (len == 0 || lblock > last)
 		return 0;
 	return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
 }
-- 
1.9.1

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