netdev - [PATCH net 3/9] ice: Fix NULL pointer dereference in switchdev

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Message-ID: <20241203215521.1646668-4-anthony.l.nguyen@intel.com>
Date: Tue,  3 Dec 2024 13:55:12 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Wojciech Drewek <wojciech.drewek@...el.com>,
	anthony.l.nguyen@...el.com,
	jiri@...nulli.us,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Simon Horman <horms@...nel.org>,
	Sujai Buvaneswaran <sujai.buvaneswaran@...el.com>
Subject: [PATCH net 3/9] ice: Fix NULL pointer dereference in switchdev

From: Wojciech Drewek <wojciech.drewek@...el.com>

Commit 608a5c05c39b ("virtchnl: support queue rate limit and quanta
size configuration") introduced new virtchnl ops:
- get_qos_caps
- cfg_q_bw
- cfg_q_quanta

New ops were added to ice_virtchnl_dflt_ops, in
commit 015307754a19 ("ice: Support VF queue rate limit and quanta
size configuration"), but not to the ice_virtchnl_repr_ops. Because
of that, if we get one of those messages in switchdev mode we end up
with NULL pointer dereference:

[ 1199.794701] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 1199.794804] Workqueue: ice ice_service_task [ice]
[ 1199.794878] RIP: 0010:0x0
[ 1199.795027] Call Trace:
[ 1199.795033]  <TASK>
[ 1199.795039]  ? __die+0x20/0x70
[ 1199.795051]  ? page_fault_oops+0x140/0x520
[ 1199.795064]  ? exc_page_fault+0x7e/0x270
[ 1199.795074]  ? asm_exc_page_fault+0x22/0x30
[ 1199.795086]  ice_vc_process_vf_msg+0x6e5/0xd30 [ice]
[ 1199.795165]  __ice_clean_ctrlq+0x734/0x9d0 [ice]
[ 1199.795207]  ice_service_task+0xccf/0x12b0 [ice]
[ 1199.795248]  process_one_work+0x21a/0x620
[ 1199.795260]  worker_thread+0x18d/0x330
[ 1199.795269]  ? __pfx_worker_thread+0x10/0x10
[ 1199.795279]  kthread+0xec/0x120
[ 1199.795288]  ? __pfx_kthread+0x10/0x10
[ 1199.795296]  ret_from_fork+0x2d/0x50
[ 1199.795305]  ? __pfx_kthread+0x10/0x10
[ 1199.795312]  ret_from_fork_asm+0x1a/0x30
[ 1199.795323]  </TASK>

Fixes: 015307754a19 ("ice: Support VF queue rate limit and quanta size configuration")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_virtchnl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
index f445e33b2028..ff4ad788d96a 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
@@ -4128,6 +4128,9 @@ static const struct ice_virtchnl_ops ice_virtchnl_dflt_ops = {
 	.get_qos_caps = ice_vc_get_qos_caps,
 	.cfg_q_bw = ice_vc_cfg_q_bw,
 	.cfg_q_quanta = ice_vc_cfg_q_quanta,
+	/* If you add a new op here please make sure to add it to
+	 * ice_virtchnl_repr_ops as well.
+	 */
 };
 
 /**
@@ -4258,6 +4261,9 @@ static const struct ice_virtchnl_ops ice_virtchnl_repr_ops = {
 	.dis_vlan_stripping_v2_msg = ice_vc_dis_vlan_stripping_v2_msg,
 	.ena_vlan_insertion_v2_msg = ice_vc_ena_vlan_insertion_v2_msg,
 	.dis_vlan_insertion_v2_msg = ice_vc_dis_vlan_insertion_v2_msg,
+	.get_qos_caps = ice_vc_get_qos_caps,
+	.cfg_q_bw = ice_vc_cfg_q_bw,
+	.cfg_q_quanta = ice_vc_cfg_q_quanta,
 };
 
 /**
-- 
2.42.0