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| author | Davide Caratti <dcaratti@redhat.com> | 2017-04-26 19:07:35 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-30 22:24:16 -0400 |
| commit | d68be71ea14d609a5f31534003319be5db422595 (patch) | |
| tree | 275aa6efd067897bd1c2e518ac66849d4b386269 | |
| parent | d1f496fd8f34a40458d0eda6be0655926559e546 (diff) | |
| download | talos-obmc-linux-d68be71ea14d609a5f31534003319be5db422595.tar.gz talos-obmc-linux-d68be71ea14d609a5f31534003319be5db422595.zip | |
tcp: fix access to sk->sk_state in tcp_poll()
avoid direct access to sk->sk_state when tcp_poll() is called on a socket
using active TCP fastopen with deferred connect. Use local variable
'state', which stores the result of sk_state_load(), like it was done in
commit 00fd38d938db ("tcp: ensure proper barriers in lockless contexts").
Fixes: 19f6d3f3c842 ("net/tcp-fastopen: Add new API support")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 059dad7deefe..1e4c76d2b827 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -533,7 +533,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait) if (tp->urg_data & TCP_URG_VALID) mask |= POLLPRI; - } else if (sk->sk_state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) { + } else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) { /* Active TCP fastopen socket with defer_connect * Return POLLOUT so application can call write() * in order for kernel to generate SYN+data |
