From 5bdf8150cd7d19b0bd672992e6f964d30ce66408 Mon Sep 17 00:00:00 2001
From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Thu, 1 Feb 2024 13:37:26 -0800
Subject: [PATCH] unix/dgram: don't clear so_error in case of MSG_PEEK

---
 sys/kern/uipc_usrreq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index 554099586bb..976490dbe2d 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -1440,7 +1440,8 @@ uipc_soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
 	    (m = STAILQ_FIRST(&so->so_rcv.uxdg_mb)) == NULL) {
 		if (so->so_error) {
 			error = so->so_error;
-			so->so_error = 0;
+			if (!(flags & MSG_PEEK))
+				so->so_error = 0;
 			SOCK_RECVBUF_UNLOCK(so);
 			SOCK_IO_RECV_UNLOCK(so);
 			return (error);