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/compat.h b/include/net/compat.h
index 5bbf8bf9efea..7c3002832d05 100644
--- a/include/net/compat.h
+++ b/include/net/compat.h
@@ -40,8 +40,8 @@ extern int put_cmsg_compat(struct msghdr*, int, int, int, void *);
 
 extern int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *, unsigned char *, int);
 
-extern int compat_mc_setsockopt(struct sock *, int, int, char __user *, int,
-        int (*)(struct sock *, int, int, char __user *, int));
+extern int compat_mc_setsockopt(struct sock *, int, int, char __user *, unsigned int,
+        int (*)(struct sock *, int, int, char __user *, unsigned int));
 extern int compat_mc_getsockopt(struct sock *, int, int, char __user *,
         int __user *, int (*)(struct sock *, int, int, char __user *,
                                 int __user *));