[TCP]: MD5 Signature Option (RFC2385) support.

Based on implementation by Rick Payne.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/timewait_sock.h b/include/net/timewait_sock.h
index be293d795e38..d7a306ea560d 100644
--- a/include/net/timewait_sock.h
+++ b/include/net/timewait_sock.h
@@ -31,6 +31,9 @@ static inline int twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
 
 static inline void twsk_destructor(struct sock *sk)
 {
+        BUG_ON(sk == NULL);
+        BUG_ON(sk->sk_prot == NULL);
+        BUG_ON(sk->sk_prot->twsk_prot == NULL);
         if (sk->sk_prot->twsk_prot->twsk_destructor != NULL)
                 sk->sk_prot->twsk_prot->twsk_destructor(sk);
 }