Commit 69a25ee2 authored by Konstantin Khlebnikov's avatar Konstantin Khlebnikov Committed by Jan Kara
Browse files

quota: paranoia: check quota tree root 



Root level in quota tree must be already allocated otherwise this block
could be used for something else.

Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 5bcd3b6f

fs/quota/quota_tree.c

+7 −0
Original line number Diff line number Diff line
@@ -349,6 +349,13 @@ static inline int dq_insert_tree(struct qtree_mem_dqinfo *info, 
				 struct dquot *dquot)

{

	int tmp = QT_TREEOFF;



#ifdef __QUOTA_QT_PARANOIA

	if (info->dqi_blocks <= QT_TREEOFF) {

		quota_error(dquot->dq_sb, "Quota tree root isn't allocated!");

		return -EIO;

	}

#endif

	return do_insert_tree(info, dquot, &tmp, 0);

}