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/tcp.h b/include/net/tcp.h
index 56b76027b85e..03a49c703377 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -394,13 +394,13 @@ extern int			tcp_getsockopt(struct sock *sk, int level,
                                                int __user *optlen);
 extern int                      tcp_setsockopt(struct sock *sk, int level, 
                                                int optname, char __user *optval, 
-                                               int optlen);
+                                               unsigned int optlen);
 extern int                      compat_tcp_getsockopt(struct sock *sk,
                                         int level, int optname,
                                         char __user *optval, int __user *optlen);
 extern int                      compat_tcp_setsockopt(struct sock *sk,
                                         int level, int optname,
-                                        char __user *optval, int optlen);
+                                        char __user *optval, unsigned int optlen);
 extern void                     tcp_set_keepalive(struct sock *sk, int val);
 extern int                      tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
                                             struct msghdr *msg,