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| author | Jerry Lee <jerrylee@qnap.com> | 2017-08-06 07:18:31 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-08-06 07:18:31 +0200 |
| commit | aec51758ce10a9c847a62a48a168f8c804c6e053 (patch) | |
| tree | a832c2ad23820173519a3cd79796636eafbe36e3 | |
| parent | ext4, project: expand inode extra size if possible (diff) | |
| download | linux-aec51758ce10a9c847a62a48a168f8c804c6e053.tar.xz linux-aec51758ce10a9c847a62a48a168f8c804c6e053.zip | |
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 c3ed9021b781..035cd3f4785e 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1927,7 +1927,8 @@ 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 */ } |