Commit a7975026 authored Mar 25, 2013 by Wang Shilong Committed by Josef Bacik Mar 28, 2013

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>

parent fdf30d1c

fs/btrfs/qgroup.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -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);

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