rxrpc: Fix sendmsg() returning EPIPE due to recvmsg() returning ENODATA

[ Upstream commit 639f181f0ee20d3249dbc55f740f0167267180f0 ]

rxrpc_sendmsg() returns EPIPE if there's an outstanding error, such as if
rxrpc_recvmsg() indicating ENODATA if there's nothing for it to read.

Change rxrpc_recvmsg() to return EAGAIN instead if there's nothing to read
as this particular error doesn't get stored in ->sk_err by the networking
core.

Also change rxrpc_sendmsg() so that it doesn't fail with delayed receive
errors (there's no way for it to report which call, if any, the error was
caused by).

Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 72de691..702ebcf 100644 (file)
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -439,7 +439,7 @@ try_again:
            list_empty(&rx->recvmsg_q) &&
            rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
                release_sock(&rx->sk);
-               return -ENODATA;
+               return -EAGAIN;
        }
 
        if (list_empty(&rx->recvmsg_q)) {

diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 1de27c3..2ec1c29 100644 (file)
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -191,7 +191,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
        /* this should be in poll */
        sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 
-       if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+       if (sk->sk_shutdown & SEND_SHUTDOWN)
                return -EPIPE;
 
        more = msg->msg_flags & MSG_MORE;