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| author | Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com> | 2019-05-09 08:13:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 20:35:37 +0300 |
| commit | 5338e8ff22f3180cfafa74b3f9aa92c03c39cc1e (patch) | |
| tree | a859b4a5fea2c39c5c4c482ad8e9f03c96b06b98 /net | |
| parent | 17617cd5557ac5b82b3d7da71772e02f2258805b (diff) | |
| download | linux-5338e8ff22f3180cfafa74b3f9aa92c03c39cc1e.tar.xz | |
tipc: fix hanging clients using poll with EPOLLOUT flag
[ Upstream commit ff946833b70e0c7f93de9a3f5b329b5ae2287b38 ]
commit 517d7c79bdb398 ("tipc: fix hanging poll() for stream sockets")
introduced a regression for clients using non-blocking sockets.
After the commit, we send EPOLLOUT event to the client even in
TIPC_CONNECTING state. This causes the subsequent send() to fail
with ENOTCONN, as the socket is still not in TIPC_ESTABLISHED state.
In this commit, we:
- improve the fix for hanging poll() by replacing sk_data_ready()
with sk_state_change() to wake up all clients.
- revert the faulty updates introduced by commit 517d7c79bdb398
("tipc: fix hanging poll() for stream sockets").
Fixes: 517d7c79bdb398 ("tipc: fix hanging poll() for stream sockets")
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/tipc/socket.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c index b542f14ed444..2851937f6e32 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -734,11 +734,11 @@ static __poll_t tipc_poll(struct file *file, struct socket *sock, switch (sk->sk_state) { case TIPC_ESTABLISHED: - case TIPC_CONNECTING: if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) revents |= EPOLLOUT; /* fall through */ case TIPC_LISTEN: + case TIPC_CONNECTING: if (!skb_queue_empty(&sk->sk_receive_queue)) revents |= EPOLLIN | EPOLLRDNORM; break; @@ -2041,7 +2041,7 @@ static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb) if (msg_data_sz(hdr)) return true; /* Empty ACK-, - wake up sleeping connect() and drop */ - sk->sk_data_ready(sk); + sk->sk_state_change(sk); msg_set_dest_droppable(hdr, 1); return false; } |