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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: 1c6bd7173d
Signed-off-by: Jerry Lee <jerrylee@qnap.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org # 3.7+
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Jerry Lee 2017-08-06 01:18:31 -04:00 committed by syphyr
parent ded0756c67
commit e68b88cded
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/resize.c
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@ -1911,7 +1911,8 @@ 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 */
}