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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: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Konstantin Khlebnikov 2015-02-12 12:36:49 +03:00 committed by Jan Kara
parent 5bcd3b6f63
commit 69a25ee217
1 changed files with 7 additions and 0 deletions
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7
fs/quota/quota_tree.c
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@ -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);
}