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/dccp/dccp.h b/net/dccp/dccp.h
index d6bc47363b1c..5ef32c2f0d6a 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -290,14 +290,14 @@ extern int	   dccp_disconnect(struct sock *sk, int flags);
 extern int         dccp_getsockopt(struct sock *sk, int level, int optname,
                                    char __user *optval, int __user *optlen);
 extern int         dccp_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_dccp_getsockopt(struct sock *sk,
                                 int level, int optname,
                                 char __user *optval, int __user *optlen);
 extern int         compat_dccp_setsockopt(struct sock *sk,
                                 int level, int optname,
-                                char __user *optval, int optlen);
+                                char __user *optval, unsigned int optlen);
 #endif
 extern int         dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 extern int         dccp_sendmsg(struct kiocb *iocb, struct sock *sk,