netdev - [PATCH net 2/2] net/sock: add WARN_ON(parent->sk) in sock

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Date:   Thu,  6 Jul 2017 08:15:07 -0700
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, sowmini.varadhan@...cle.com,
        santosh.shilimkar@...cle.com
Subject: [PATCH net 2/2] net/sock: add WARN_ON(parent->sk) in sock_graft()

sock_graft() unilaterally sets up parent->sk based on the
assumption that the existing parent->sk is null. If this
condition is not true, then the existing parent->sk would
be leaked, so add a WARN_ON() to alert callers who may fall
in this category.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
---
 include/net/sock.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 48e4d5c..8c85791 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1697,6 +1697,7 @@ static inline void sock_orphan(struct sock *sk)
 
 static inline void sock_graft(struct sock *sk, struct socket *parent)
 {
+	WARN_ON(parent->sk);
 	write_lock_bh(&sk->sk_callback_lock);
 	sk->sk_wq = parent->wq;
 	parent->sk = sk;
-- 
1.7.1