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 7446d8b4282d58cee32d435c930c23b1b43092a4..8e325227b4c01153715f396662aeebea5231a219 100644 (file)
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -457,6 +457,9 @@ static int data_sock_getsockopt(struct socket *sock, int level, int optname,
        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)