From 9e3513fc309109168113ce555448594b6f710741 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
Date: Wed, 25 Nov 2020 16:09:42 +0100
Subject: [PATCH] ipv4: IP_ADD_MEMBERSHIP twice should return EADDRINUSE

also IP_ADD_SOURCE_MEMBERSHIP

Change-Id: Icc9af4fc7ffe6457ca968fad3fba46f0942a9e3f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3418
Reviewed-by: Rene Gollent <rene@gollent.com>
---
 src/add-ons/kernel/network/protocols/ipv4/multicast.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/add-ons/kernel/network/protocols/ipv4/multicast.cpp b/src/add-ons/kernel/network/protocols/ipv4/multicast.cpp
index 4cedcd5976..94a87cf5c6 100644
--- a/src/add-ons/kernel/network/protocols/ipv4/multicast.cpp
+++ b/src/add-ons/kernel/network/protocols/ipv4/multicast.cpp
@@ -195,7 +195,8 @@ MulticastFilter<Addressing>::GetState(const AddressType &groupAddress,
 			return status;
 		}
 
-	}
+	} else if (create)
+		return EADDRINUSE;
 
 	return B_OK;
 }