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Btrfs: set qgroup_ulist to be null after calling ulist_free()

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We call ulist_free(qgroup_ulist) in btrfs_free_qgroup_config(),
and btrfs_free_qgroup_config() may be called in two cases:

(1)umount filesystem
(2)disabling quota

However, if we firstly disable quota and then umount filesystem,
a double free happens. Fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Wang Shilong 2013-07-13 21:02:54 +08:00 committed by Chris Mason
parent 647f63bd36
commit 1e7bac1ef7
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/qgroup.c
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@ -460,7 +460,13 @@ void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
}
kfree(qgroup);
}
/*
* we call btrfs_free_qgroup_config() when umounting
* filesystem and disabling quota, so we set qgroup_ulit
* to be null here to avoid double free.
*/
ulist_free(fs_info->qgroup_ulist);
fs_info->qgroup_ulist = NULL;
}
static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,