From: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Date: Thu, 8 Aug 2019 07:39:34 -0700
Subject: ice: Check root pointer for validity
Patch-mainline: v5.4-rc1
Git-commit: ade78c2ec1def21bdaa597d4d01a7d6b9343fa60
References: jsc#SLE-7926

ice_sched_get_tc_node uses pi->root without checking for NULL. Add a
check to prevent NULL pointer dereference.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_sched.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -284,7 +284,7 @@ struct ice_sched_node *ice_sched_get_tc_
 {
 	u8 i;
 
-	if (!pi)
+	if (!pi || !pi->root)
 		return NULL;
 	for (i = 0; i < pi->root->num_children; i++)
 		if (pi->root->children[i]->tc_num == tc)