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/linux/mroute6.h b/include/linux/mroute6.h
index 43dc97e32183..b191865a6ca3 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -134,7 +134,7 @@ static inline int ip6_mroute_opt(int opt)
 struct sock;
 
 #ifdef CONFIG_IPV6_MROUTE
-extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, int);
+extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
 extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
 extern int ip6_mr_input(struct sk_buff *skb);
 extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
@@ -143,7 +143,7 @@ extern void ip6_mr_cleanup(void);
 #else
 static inline
 int ip6_mroute_setsockopt(struct sock *sock,
-                          int optname, char __user *optval, int optlen)
+                          int optname, char __user *optval, unsigned int optlen)
 {
         return -ENOPROTOOPT;
 }