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/include/net/ip.h b/include/net/ip.h
index 5b26a0bd178e..2f47e5482b55 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -381,10 +381,10 @@ extern int ip_options_rcv_srr(struct sk_buff *skb);
 extern void     ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
 extern int      ip_cmsg_send(struct net *net,
                              struct msghdr *msg, struct ipcm_cookie *ipc);
-extern int      ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen);
+extern int      ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
 extern int      ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
 extern int      compat_ip_setsockopt(struct sock *sk, int level,
-                        int optname, char __user *optval, int optlen);
+                        int optname, char __user *optval, unsigned int optlen);
 extern int      compat_ip_getsockopt(struct sock *sk, int level,
                         int optname, char __user *optval, int __user *optlen);
 extern int      ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));