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authorEric Dumazet <edumazet@google.com>2018-10-02 12:35:05 -0700
committerDavid S. Miller <davem@davemloft.net>2018-10-02 15:52:12 -0700
commit2ab2ddd301a22ca3c5f0b743593e4ad2953dfa53 (patch)
tree3ec72a50a6be78a4bc8eb73d8c9bd14df798aa26 /include
parentff58e2df62ce29d0552278c290ae494b30fe0c6f (diff)
downloadlinux-2ab2ddd301a22ca3c5f0b743593e4ad2953dfa53.tar.bz2
inet: make sure to grab rcu_read_lock before using ireq->ireq_opt
Timer handlers do not imply rcu_read_lock(), so my recent fix triggered a LOCKDEP warning when SYNACK is retransmit. Lets add rcu_read_lock()/rcu_read_unlock() pairs around ireq->ireq_opt usages instead of guessing what is done by callers, since it is not worth the pain. Get rid of ireq_opt_deref() helper since it hides the logic without real benefit, since it is now a standard rcu_dereference(). Fixes: 1ad98e9d1bdf ("tcp/dccp: fix lockdep issue when SYN is backlogged") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/inet_sock.h5
1 files changed, 0 insertions, 5 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index a8cd5cf9ff5b..a80fd0ac4563 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -130,11 +130,6 @@ static inline int inet_request_bound_dev_if(const struct sock *sk,
return sk->sk_bound_dev_if;
}
-static inline struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq)
-{
- return rcu_dereference(ireq->ireq_opt);
-}
-
struct inet_cork {
unsigned int flags;
__be32 addr;