diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-11-02 19:53:04 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-03 07:51:39 +0100 |
| commit | 9eba9353388da7bfac9694dfe94c15365d49ebd6 (patch) | |
| tree | 56d6e257cef00eff4bb0e2af027509011615e4fa /net/ipv4/tcp_fastopen.c | |
| parent | bpf: fix verifier NULL pointer dereference (diff) | |
| download | linux-9eba9353388da7bfac9694dfe94c15365d49ebd6.tar.xz linux-9eba9353388da7bfac9694dfe94c15365d49ebd6.zip | |
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 <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Christoph Paasch <cpaasch@apple.com>
Reviewed-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_fastopen.c')
| -rw-r--r-- | net/ipv4/tcp_fastopen.c | 8 |
1 files 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); |