locks: fix NULL-deref in generic_delete_lease

commit 0efaa7e82f02fe69c05ad28e905f31fc86e6f08e
  locks: generic_delete_lease doesn't need a file_lock at all

moves the call to fl->fl_lmops->lm_change() to a place in the
code where fl might be a non-lease lock.
When that happens, fl_lmops is NULL and an Oops ensures.

So add an extra test to restore correct functioning.

Reported-by: Linda Walsh <suse@tlinx.org>
Link: https://bugzilla.suse.com/show_bug.cgi?id=912569
Cc: stable@vger.kernel.org (v3.18)
Fixes: 0efaa7e82f02fe69c05ad28e905f31fc86e6f08e
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>

diff --git a/fs/locks.c b/fs/locks.c
index 735b8d3fa78c92bf746aff05475be1fa2a82abd6..59e2f905e4ffea324dbf44faf1b666974adc6c23 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1702,7 +1702,7 @@ static int generic_delete_lease(struct file *filp)
                        break;
        }
        trace_generic_delete_lease(inode, fl);
-       if (fl)
+       if (fl && IS_LEASE(fl))
                error = fl->fl_lmops->lm_change(before, F_UNLCK, &dispose);
        spin_unlock(&inode->i_lock);
        locks_dispose_list(&dispose);