linux-kernel - [PATCH 5.3 014/193] net: mscc: ocelot: fix NULL pointer on LAG slave removal

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Date:   Mon, 11 Nov 2019 19:26:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.3 014/193] net: mscc: ocelot: fix NULL pointer on LAG slave removal

From: Claudiu Manoil <claudiu.manoil@....com>

[ Upstream commit 3b3eed8eec47259939ee6c3d58aea1c311ddee3b ]

lag_upper_info may be NULL on slave removal.

Fixes: dc96ee3730fc ("net: mscc: ocelot: add bonding support")
Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
Signed-off-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mscc/ocelot.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1543,7 +1543,8 @@ static int ocelot_netdevice_event(struct
 		struct netdev_lag_upper_info *lag_upper_info = info->upper_info;
 		struct netlink_ext_ack *extack;
 
-		if (lag_upper_info->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
+		if (lag_upper_info &&
+		    lag_upper_info->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
 			extack = netdev_notifier_info_to_extack(&info->info);
 			NL_SET_ERR_MSG_MOD(extack, "LAG device using unsupported Tx type");