linux-kernel - [PATCH 5.5 332/367] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set

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Date:   Mon, 10 Feb 2020 04:34:05 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Verma, Aashish" <aashishx.verma@...el.com>,
        "Tan, Tee Min" <tee.min.tan@...el.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.5 332/367] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set_filter

From: "Verma, Aashish" <aashishx.verma@...el.com>

[ Upstream commit 2ba31cd93784b61813226d259fd94a221ecd9d61 ]

Without checking for IFF_MULTICAST flag, it is wrong to assume multicast
filtering is always enabled. By checking against IFF_MULTICAST, now
the driver behaves correctly when the multicast support is toggled by below
command:-
  ip link set <devname> multicast off|on

Fixes: 477286b53f55 ("stmmac: add GMAC4 core support")
Signed-off-by: Verma, Aashish <aashishx.verma@...el.com>
Tested-by: Tan, Tee Min <tee.min.tan@...el.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -420,7 +420,7 @@ static void dwmac4_set_filter(struct mac
 		value |= GMAC_PACKET_FILTER_PM;
 		/* Set all the bits of the HASH tab */
 		memset(mc_filter, 0xff, sizeof(mc_filter));
-	} else if (!netdev_mc_empty(dev)) {
+	} else if (!netdev_mc_empty(dev) && (dev->flags & IFF_MULTICAST)) {
 		struct netdev_hw_addr *ha;
 
 		/* Hash filter for multicast */