inet{6}_request_sock: Init ->opt and ->pktopts in the constructor

Wei Yongjun noticed that we may call reqsk_free on request sock objects where
the opt fields may not be initialized, fix it by introducing inet_reqsk_alloc
where we initialize ->opt to NULL and set ->pktopts to NULL in
inet6_reqsk_alloc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 13 insertions, 1 deletions

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 10b666b61ad..cde056e0818 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -396,8 +396,10 @@ static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *op
 {
         struct request_sock *req = reqsk_alloc(ops);
 
-        if (req != NULL)
+        if (req != NULL) {
                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
+                inet6_rsk(req)->pktopts = NULL;
+        }
 
         return req;
 }
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index a42cd63d241..9fabe5b3891 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -197,4 +197,14 @@ static inline int inet_iif(const struct sk_buff *skb)
         return skb->rtable->rt_iif;
 }
 
+static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
+{
+        struct request_sock *req = reqsk_alloc(ops);
+
+        if (req != NULL)
+                inet_rsk(req)->opt = NULL;
+
+        return req;
+}
+
 #endif  /* _INET_SOCK_H */