isdn: mISDN: socket: Fix set-but-unused variables.
The variable 'len' is set but unused in data_sock_getsockopt().
The code should use 'len' to validate that the user's socket option is
indeed the right size.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index 7446d8b..8e32522 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -457,6 +457,9 @@
if (get_user(len, optlen))
return -EFAULT;
+ if (len != sizeof(char))
+ return -EINVAL;
+
switch (optname) {
case MISDN_TIME_STAMP:
if (_pms(sk)->cmask & MISDN_TIME_STAMP)