From 69a25ee217ba8c93a6d4c6671d9208c0155c0485 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Thu, 12 Feb 2015 12:36:49 +0300
Subject: 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>
---
fs/quota/quota_tree.c | 7 +++++++
1 file changed, 7 insertions(+)
(limited to 'fs')
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index d65877f..58efb83 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -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);
}
--
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