diff options
| author | Jerry Lee <jerrylee@qnap.com> | 2017-08-06 01:18:31 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 09:08:48 -0700 |
| commit | 31cd127ca69a1aedd24b9aa7ac806e6071c84655 (patch) | |
| tree | 3de3062ec8247747959bf4be8cd167bbcb7f1f84 | |
| parent | bad9f6142ce1141b7e4969d898cf0e2d61e90d5b (diff) | |
ext4: fix overflow caused by missing cast in ext4_resize_fs()
commit aec51758ce10a9c847a62a48a168f8c804c6e053 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 34038e3598d5..74516efd874c 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1926,7 +1926,8 @@ 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 */ } |