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/sctp/structs.h b/include/net/sctp/structs.h
index 42d00ced5eb8..6e5f0e0c7967 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -544,7 +544,7 @@ struct sctp_af {
                                          int level,
                                          int optname,
                                          char __user *optval,
-                                         int optlen);
+                                         unsigned int optlen);
         int             (*getsockopt)   (struct sock *sk,
                                          int level,
                                          int optname,
@@ -554,7 +554,7 @@ struct sctp_af {
                                          int level,
                                          int optname,
                                          char __user *optval,
-                                         int optlen);
+                                         unsigned int optlen);
         int             (*compat_getsockopt)    (struct sock *sk,
                                          int level,
                                          int optname,