linux-kernel - [PATCH 3.2 048/101] nlm: Ensure callback code also checks that the files match

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Message-ID: <lsq.1496331655.658128644@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:40:55 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Trond Myklebust" <trond.myklebust@...marydata.com>,
        "Anna Schumaker" <Anna.Schumaker@...app.com>,
        "Pankaj Singh" <psingh.ait@...il.com>
Subject: [PATCH 3.2 048/101] nlm: Ensure callback code also checks that
 the files match

3.2.89-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Trond Myklebust <trond.myklebust@...marydata.com>

commit 251af29c320d86071664f02c76f0d063a19fefdf upstream.

It is not sufficient to just check that the lock pids match when
granting a callback, we also need to ensure that we're granting
the callback on the right file.

Reported-by: Pankaj Singh <psingh.ait@...il.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
[bwh: Backported to 3.2: open-code file_inode()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/lockd/lockd.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -348,7 +348,8 @@ static inline int nlm_privileged_request
 static inline int nlm_compare_locks(const struct file_lock *fl1,
 				    const struct file_lock *fl2)
 {
-	return	fl1->fl_pid   == fl2->fl_pid
+	return fl1->fl_file->f_dentry->d_inode == fl2->fl_file->f_dentry->d_inode
+	     && fl1->fl_pid   == fl2->fl_pid
 	     && fl1->fl_owner == fl2->fl_owner
 	     && fl1->fl_start == fl2->fl_start
 	     && fl1->fl_end   == fl2->fl_end