net: Make setsockopt() optlen be unsigned.

This provides safety against negative optlen at the type
level instead of depending upon (sometimes non-trivial)
checks against this sprinkled all over the the place, in
each and every implementation.

Based upon work done by Arjan van de Ven and feedback
from Linus Torvalds.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/udp_impl.h b/net/ipv6/udp_impl.h
index 6bb303471e20..d7571046bfc4 100644
--- a/net/ipv6/udp_impl.h
+++ b/net/ipv6/udp_impl.h
@@ -16,10 +16,10 @@ extern int	udp_v6_get_port(struct sock *sk, unsigned short snum);
 extern int      udpv6_getsockopt(struct sock *sk, int level, int optname,
                                  char __user *optval, int __user *optlen);
 extern int      udpv6_setsockopt(struct sock *sk, int level, int optname,
-                                 char __user *optval, int optlen);
+                                 char __user *optval, unsigned int optlen);
 #ifdef CONFIG_COMPAT
 extern int      compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
-                                        char __user *optval, int optlen);
+                                        char __user *optval, unsigned int optlen);
 extern int      compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
                                        char __user *optval, int __user *optlen);
 #endif