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espintcp: recv() should return 0 when the peer socket is closed

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man 2 recv says:

    RETURN VALUE

    When a stream socket peer has performed an orderly shutdown, the
    return value will be 0 (the traditional "end-of-file" return).

Currently, this works for blocking reads, but non-blocking reads will
return -EAGAIN. This patch overwrites that return value when the peer
won't send us any more data.

Fixes: e27cca96cd ("xfrm: add espintcp (RFC 8229)")
Reported-by: Andrew Cagney <cagney@libreswan.org>
Tested-by: Andrew Cagney <cagney@libreswan.org>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Sabrina Dubroca 2020-07-16 10:09:02 +02:00 committed by Steffen Klassert
parent ac1321efb1
commit e229c877cd
1 changed files with 4 additions and 1 deletions
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5
net/xfrm/espintcp.c
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@ -109,8 +109,11 @@ static int espintcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
flags |= nonblock ? MSG_DONTWAIT : 0;
skb = __skb_recv_datagram(sk, &ctx->ike_queue, flags, &off, &err);
if (!skb)
if (!skb) {
if (err == -EAGAIN && sk->sk_shutdown & RCV_SHUTDOWN)
return 0;
return err;
}
copied = len;
if (copied > skb->len)