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| author | Theodore Ts'o <tytso@mit.edu> | 2009-01-18 00:41:37 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-01-18 00:41:37 +0100 |
| commit | 06a279d636734da32bb62dd2f7b0ade666f65d7c (patch) | |
| tree | e3fb1a899ea7a9d527ff0d8edf3ca23778321728 /fs/ext4/ext4.h | |
| parent | ext4: fix wrong use of do_div (diff) | |
| download | linux-06a279d636734da32bb62dd2f7b0ade666f65d7c.tar.xz linux-06a279d636734da32bb62dd2f7b0ade666f65d7c.zip | |
ext4: only use i_size_high for regular files
Directories are not allowed to be bigger than 2GB, so don't use
i_size_high for anything other than regular files. E2fsck should
complain about these inodes, but the simplest thing to do for the
kernel is to only use i_size_high for regular files.
This prevents an intentially corrupted filesystem from causing the
kernel to burn a huge amount of CPU and issuing error messages such
as:
EXT4-fs warning (device loop0): ext4_block_to_path: block 135090028 > max
Thanks to David Maciejak from Fortinet's FortiGuard Global Security
Research Team for reporting this issue.
http://bugzilla.kernel.org/show_bug.cgi?id=12375
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index c668e4377d76..aafc9eba1c25 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1206,8 +1206,11 @@ static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, static inline loff_t ext4_isize(struct ext4_inode *raw_inode) { - return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | - le32_to_cpu(raw_inode->i_size_lo); + if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) + return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | + le32_to_cpu(raw_inode->i_size_lo); + else + return (loff_t) le32_to_cpu(raw_inode->i_size_lo); } static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |