From: Michael Chan <michael.chan@broadcom.com>
Date: Wed, 11 Apr 2018 11:50:13 -0400
Subject: bnxt_en: Fix ethtool -x crash when device is down.
Patch-mainline: v4.17-rc1
Git-commit: 7991cb9cfbce1b60ac1cff819350b05de4d902e1
References: bsc#1086282 FATE#324873

Fix ethtool .get_rxfh() crash by checking for valid indirection table
address before copying the data.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -858,17 +858,22 @@ static int bnxt_get_rxfh(struct net_devi
 			 u8 *hfunc)
 {
 	struct bnxt *bp = netdev_priv(dev);
-	struct bnxt_vnic_info *vnic = &bp->vnic_info[0];
+	struct bnxt_vnic_info *vnic;
 	int i = 0;
 
 	if (hfunc)
 		*hfunc = ETH_RSS_HASH_TOP;
 
-	if (indir)
+	if (!bp->vnic_info)
+		return 0;
+
+	vnic = &bp->vnic_info[0];
+	if (indir && vnic->rss_table) {
 		for (i = 0; i < HW_HASH_INDEX_SIZE; i++)
 			indir[i] = le16_to_cpu(vnic->rss_table[i]);
+	}
 
-	if (key)
+	if (key && vnic->rss_hash_key)
 		memcpy(key, vnic->rss_hash_key, HW_HASH_KEY_SIZE);
 
 	return 0;