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| author | Utako Kusaka <u-kusaka@wm.jp.nec.com> | 2011-07-27 22:11:20 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-07-27 22:11:20 -0400 |
| commit | 29ae07b702cb77dbc24b0843f15ee8cf8a642311 (patch) | |
| tree | 4d9d3717e2be5cb335fd4f32c9207bf0b55caac9 | |
| parent | 0e1147b001793593624e80b3c0a1790822b6baca (diff) | |
| download | linux-29ae07b702cb77dbc24b0843f15ee8cf8a642311.tar.gz linux-29ae07b702cb77dbc24b0843f15ee8cf8a642311.tar.bz2 linux-29ae07b702cb77dbc24b0843f15ee8cf8a642311.zip | |
ext4: Fix overflow caused by missing cast in ext4_fallocate()
The logical block number in map.l_blk is a __u32, and so before we
shift it left, by the block size, we neeed cast it to a 64-bit size.
Otherwise i_size can be corrupted on an ENOSPC.
# df -T /mnt/mp1
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda6 ext4 9843276 153056 9190200 2% /mnt/mp1
# fallocate -o 0 -l 2199023251456 /mnt/mp1/testfile
fallocate: /mnt/mp1/testfile: fallocate failed: No space left on device
# stat /mnt/mp1/testfile
File: `/mnt/mp1/testfile'
Size: 4293656576 Blocks: 19380440 IO Block: 4096 regular file
Device: 806h/2054d Inode: 12 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2011-07-25 13:01:31.414490496 +0900
Modify: 2011-07-25 13:01:31.414490496 +0900
Change: 2011-07-25 13:01:31.454490495 +0900
Signed-off-by: Utako Kusaka <u-kusaka@wm.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
--
fs/ext4/extents.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
| -rw-r--r-- | fs/ext4/extents.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index a25bbdc7d493..57cf568a98ab 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3824,7 +3824,7 @@ retry: blkbits) >> blkbits)) new_size = offset + len; else - new_size = (map.m_lblk + ret) << blkbits; + new_size = ((loff_t) map.m_lblk + ret) << blkbits; ext4_falloc_update_inode(inode, mode, new_size, (map.m_flags & EXT4_MAP_NEW)); |