netdev - [PATCH 5.4.y] net: dsa: mt7530: fix VLAN traffic leaks again

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Message-Id: <20210823070928.166082-1-dqfext@gmail.com>
Date:   Mon, 23 Aug 2021 15:09:27 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     stable@...r.kernel.org
Cc:     Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sean Wang <sean.wang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Russell King <linux@...linux.org.uk>,
        netdev@...r.kernel.org (open list:MEDIATEK SWITCH DRIVER),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 5.4.y] net: dsa: mt7530: fix VLAN traffic leaks again

[ Upstream commit 7428022b50d0fbb4846dd0f00639ea09d36dff02 ]

When a port leaves a VLAN-aware bridge, the current code does not clear
other ports' matrix field bit. If the bridge is later set to VLAN-unaware
mode, traffic in the bridge may leak to that port.

Remove the VLAN filtering check in mt7530_port_bridge_leave.

Fixes: 4fe4e1f48ba1 ("net: dsa: mt7530: fix VLAN traffic leaks")
Fixes: 83163f7dca56 ("net: dsa: mediatek: add VLAN support for MT7530")
Signed-off-by: DENG Qingfang <dqfext@...il.com>
Reviewed-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/dsa/mt7530.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index aec606058d98..fc45af12612f 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -840,11 +840,8 @@ mt7530_port_bridge_leave(struct dsa_switch *ds, int port,
 		/* Remove this port from the port matrix of the other ports
 		 * in the same bridge. If the port is disabled, port matrix
 		 * is kept and not being setup until the port becomes enabled.
-		 * And the other port's port matrix cannot be broken when the
-		 * other port is still a VLAN-aware port.
 		 */
-		if (dsa_is_user_port(ds, i) && i != port &&
-		   !dsa_port_is_vlan_filtering(&ds->ports[i])) {
+		if (dsa_is_user_port(ds, i) && i != port) {
 			if (dsa_to_port(ds, i)->bridge_dev != bridge)
 				continue;
 			if (priv->ports[i].enable)
-- 
2.25.1