diff options
| author | Jerry Lee <jerrylee@qnap.com> | 2017-08-06 01:18:31 -0400 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-08-12 12:17:18 +0200 |
| commit | 62073f9a349a7eb89dc6bcb8837a3706e6010390 (patch) | |
| tree | e350606883714a80164ac04c5a01fffc74ddb59e | |
| parent | 3ac87b315ceeacb0f487530e3962ae7e798a2231 (diff) | |
ext4: fix overflow caused by missing cast in ext4_resize_fs()
On a 32-bit platform, the value of n_blcoks_count may be wrong during
the file system is resized to size larger than 2^32 blocks. This may
caused the superblock being corrupted with zero blocks count.
Fixes: 1c6bd7173d66
Signed-off-by: Jerry Lee <jerrylee@qnap.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org # 3.7+
| -rw-r--r-- | fs/ext4/resize.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index d534e5899..74db6d94b 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1929,7 +1929,8 @@ retry: n_desc_blocks = o_desc_blocks + le16_to_cpu(es->s_reserved_gdt_blocks); n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); - n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb); + n_blocks_count = (ext4_fsblk_t)n_group * + EXT4_BLOCKS_PER_GROUP(sb); n_group--; /* set to last group number */ } |