From 736a80bbfda709fb3631f5f62056f250a38e5804 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Thu, 4 Jan 2018 15:51:53 +0100
Subject: [PATCH] mac80211: mesh: drop frames appearing to be from us
Git-commit: 736a80bbfda709fb3631f5f62056f250a38e5804
Patch-mainline: v4.15-rc8
References: bsc#1051510

If there are multiple mesh stations with the same MAC address,
they will both get confused and start throwing warnings.

Obviously in this case nothing can actually work anyway, so just
drop frames that look like they're from ourselves early on.

Reported-by: Gui Iribarren <gui@altermundi.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/mac80211/rx.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3636,6 +3636,8 @@ static bool ieee80211_accept_frame(struc
 		}
 		return true;
 	case NL80211_IFTYPE_MESH_POINT:
+		if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
+			return false;
 		if (multicast)
 			return true;
 		return ether_addr_equal(sdata->vif.addr, hdr->addr1);