path: root/fs
diff options
authorEryu Guan <guaneryu@gmail.com>2015-05-14 19:00:45 -0400
committerTheodore Ts'o <tytso@mit.edu>2015-05-14 19:00:45 -0400
commit2f974865ffdfe7b9f46a9940836c8b167342563d (patch)
treefa8e553e8343141ff00a84c9589b54783cb1dbb6 /fs
parent9d506594069355d1fb2de3f9104667312ff08ed3 (diff)
ext4: check for zero length extent explicitly
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@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs')
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d74e08029643..451b92a9958a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -377,7 +377,7 @@ 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);

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