From 9eba9353388da7bfac9694dfe94c15365d49ebd6 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 2 Nov 2017 11:53:04 -0700 Subject: tcp: fix a lockdep issue in tcp_fastopen_reset_cipher() icsk_accept_queue.fastopenq.lock is only fully initialized at listen() time. LOCKDEP is not happy if we attempt a spin_lock_bh() on it, because of missing annotation. (Although kernel runs just fine) Lets use net->ipv4.tcp_fastopen_ctx_lock to protect ctx access. Fixes: 1fba70e5b6be ("tcp: socket option to set TCP fast open key") Signed-off-by: Eric Dumazet Cc: Yuchung Cheng Cc: Christoph Paasch Reviewed-by: Christoph Paasch Signed-off-by: David S. Miller --- net/ipv4/tcp_fastopen.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c index e0a4b56644aa..91762be58acc 100644 --- a/net/ipv4/tcp_fastopen.c +++ b/net/ipv4/tcp_fastopen.c @@ -92,20 +92,18 @@ error: kfree(ctx); memcpy(ctx->key, key, len); + spin_lock(&net->ipv4.tcp_fastopen_ctx_lock); if (sk) { q = &inet_csk(sk)->icsk_accept_queue.fastopenq; - spin_lock_bh(&q->lock); octx = rcu_dereference_protected(q->ctx, - lockdep_is_held(&q->lock)); + lockdep_is_held(&net->ipv4.tcp_fastopen_ctx_lock)); rcu_assign_pointer(q->ctx, ctx); - spin_unlock_bh(&q->lock); } else { - spin_lock(&net->ipv4.tcp_fastopen_ctx_lock); octx = rcu_dereference_protected(net->ipv4.tcp_fastopen_ctx, lockdep_is_held(&net->ipv4.tcp_fastopen_ctx_lock)); rcu_assign_pointer(net->ipv4.tcp_fastopen_ctx, ctx); - spin_unlock(&net->ipv4.tcp_fastopen_ctx_lock); } + spin_unlock(&net->ipv4.tcp_fastopen_ctx_lock); if (octx) call_rcu(&octx->rcu, tcp_fastopen_ctx_free); -- cgit v1.2.3-58-ga151