linux-kernel - [PATCH 4.9 051/138] fs/9p: Compare qid.path in v9fs_test

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Date:   Tue, 28 Nov 2017 11:22:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Latchesar Ionkov <lucho@...kov.net>,
        Tuomas Tynkkynen <tuomas@...era.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.9 051/138] fs/9p: Compare qid.path in v9fs_test_inode

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tuomas Tynkkynen <tuomas@...era.com>

commit 8ee031631546cf2f7859cc69593bd60bbdd70b46 upstream.

Commit fd2421f54423 ("fs/9p: When doing inode lookup compare qid details
and inode mode bits.") transformed v9fs_qid_iget() to use iget5_locked()
instead of iget_locked(). However, the test() callback is not checking
fid.path at all, which means that a lookup in the inode cache can now
accidentally locate a completely wrong inode from the same inode hash
bucket if the other fields (qid.type and qid.version) match.

Fixes: fd2421f54423 ("fs/9p: When doing inode lookup compare qid details and inode mode bits.")
Reviewed-by: Latchesar Ionkov <lucho@...kov.net>
Signed-off-by: Tuomas Tynkkynen <tuomas@...era.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/9p/vfs_inode.c      |    3 +++
 fs/9p/vfs_inode_dotl.c |    3 +++
 2 files changed, 6 insertions(+)

--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -483,6 +483,9 @@ static int v9fs_test_inode(struct inode
 
 	if (v9inode->qid.type != st->qid.type)
 		return 0;
+
+	if (v9inode->qid.path != st->qid.path)
+		return 0;
 	return 1;
 }
 
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -87,6 +87,9 @@ static int v9fs_test_inode_dotl(struct i
 
 	if (v9inode->qid.type != st->qid.type)
 		return 0;
+
+	if (v9inode->qid.path != st->qid.path)
+		return 0;
 	return 1;
 }