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[04/10] espintcp: recv() should return 0 when the peer socket is closed

Message ID 20200731071804.29557-5-steffen.klassert@secunet.com
State Accepted
Delegated to: David Miller
Headers show
Series [01/10] xfrm: policy: match with both mark and mask on user interfaces | expand

Commit Message

Steffen Klassert July 31, 2020, 7:17 a.m. UTC
From: Sabrina Dubroca <sd@queasysnail.net>

man 2 recv says:


    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: e27cca96cd68 ("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>
 net/xfrm/espintcp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/net/xfrm/espintcp.c b/net/xfrm/espintcp.c
index 5d3d2b98c62d..cb83e3664680 100644
--- a/net/xfrm/espintcp.c
+++ b/net/xfrm/espintcp.c
@@ -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)