From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
To: linux-fsdevel@vger.kernel.org, Jan Kara <jack@suse.cz>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] quota: paranoia: check quota tree root
Date: Thu, 12 Feb 2015 12:36:49 +0300 [thread overview]
Message-ID: <20150212093649.6117.62111.stgit@buzz> (raw)
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>
---
fs/quota/quota_tree.c | 7 +++++++
1 file changed, 7 insertions(+)
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);
}
next reply other threads:[~2015-02-12 9:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-12 9:36 Konstantin Khlebnikov [this message]
2015-02-12 14:04 ` [PATCH] quota: paranoia: check quota tree root Jan Kara
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