Patch "mac80211: mesh: drop frames appearing to be from us" has been added to the 4.4-stable tree

Patch "mac80211: mesh: drop frames appearing to be from us" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mac80211: mesh: drop frames appearing to be from us

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mac80211-mesh-drop-frames-appearing-to-be-from-us.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb 28 16:19:30 CET 2018
From: Johannes Berg <johannes.berg@intel.com>
Date: Thu, 4 Jan 2018 15:51:53 +0100
Subject: mac80211: mesh: drop frames appearing to be from us

From: Johannes Berg <johannes.berg@intel.com>


[ Upstream commit 736a80bbfda709fb3631f5f62056f250a38e5804 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mac80211/rx.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3367,6 +3367,8 @@ 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);


Patches currently in stable-queue which might be from johannes.berg@intel.com are

queue-4.4/mac80211-mesh-drop-frames-appearing-to-be-from-us.patch