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Btrfs: fix double free in the btrfs_qgroup_account_ref() 

The function btrfs_find_all_roots is responsible to allocate
memory for 'roots' and free it if errors happen,so the caller should not
free it again since the work has been done.

Besides,'tmp' is allocated after the function btrfs_find_all_roots,
so we can return directly if btrfs_find_all_roots() fails.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Wang Shilong 2013-03-25 11:08:23 +00:00 committed by Josef Bacik
parent fdf30d1c1b
commit a7975026ff
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/qgroup.c
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@ -1153,7 +1153,7 @@ int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
ret = btrfs_find_all_roots(trans, fs_info, node->bytenr,
sgn > 0 ? node->seq - 1 : node->seq, &roots);
if (ret < 0)
goto out;
return ret;
spin_lock(&fs_info->qgroup_lock);
quota_root = fs_info->quota_root;
@ -1275,7 +1275,6 @@ int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
ret = 0;
unlock:
spin_unlock(&fs_info->qgroup_lock);
out:
ulist_free(roots);
ulist_free(tmp);