[PATCH] fcntl: don't leak fd reference when fixup_compat_flock fails

[Jeff Layton]

From: Jeff Layton <jlay...@redhat.com>

Currently we just return err here, but we need to put the fd reference
first.

Fixes: 94073ad77fff (fs/locks: don't mess with the address limit in 
compat_fcntl64)
Signed-off-by: Jeff Layton <jlay...@redhat.com>
---
 fs/fcntl.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

I don't have a great way to test this. There's another similar bug in
the F_GETLK64 case as well, but Vitaly is looking at another problem
there.

diff --git a/fs/fcntl.c b/fs/fcntl.c
index e44a95dd3f86..0793eca4d0ec 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -632,9 +632,8 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned 
int, cmd,
                if (err)
                        break;
                err = fixup_compat_flock(&flock);
-               if (err)
-                       return err;
-               err = put_compat_flock(&flock, compat_ptr(arg));
+               if (!err)
+                       err = put_compat_flock(&flock, compat_ptr(arg));
                break;
        case F_GETLK64:
        case F_OFD_GETLK:
-- 
2.14.3