tree 880f1cd67f0a8c1fb1dfbb1359358d930b0f611a
parent 823ba01fc07751200c43e45733925a98b73eac3a
author Tao Ma <boyu.mt@taobao.com> 1310424162 -0400
committer Theodore Ts'o <tytso@mit.edu> 1310424162 -0400

ext4: Fix a double free of sbi->s_group_info in ext4_mb_init_backend

If we meet with an error in ext4_mb_add_groupinfo, we kfree
sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)], but fail to
reset it to NULL. So the caller ext4_mb_init_backend will try to kfree
it again and causes a double free. So fix it by resetting it to NULL.

Some typo in comments of mballoc.c are also changed.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>