Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU

commit 23bc6ab0a0912146fd674a0becc758c3162baabc upstream.

When we retrieve imtu value from userspace we should use 16 bit pointer
cast instead of 32 as it's defined that way in headers. Fixes setsockopt
calls on big-endian platforms.

Signed-off-by: Amadeusz Sławiński <amadeusz.slawinski@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 74e59cdd047b0c08fae9186293cc10d669985e95..6c89d61aaa6f9935c1fafc10217075bdc3a35a9e 100644 (file)
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -630,7 +630,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, ch
                        break;
                }
 
-               if (get_user(opt, (u32 __user *) optval)) {
+               if (get_user(opt, (u16 __user *) optval)) {
                        err = -EFAULT;
                        break;
                }