ice: arfs: fix use-after-free when freeing @rx_cpu_rmap

From: Alexander Lobakin <[email protected]>

[ Upstream commit d7442f512b71fc63a99c8a801422dde4fbbf9f93 ]

The CI testing bots triggered the following splat:

[  718.203054] BUG: KASAN: use-after-free in free_irq_cpu_rmap+0x53/0x80
[  718.206349] Read of size 4 at addr ffff8881bd127e00 by task sh/20834
[  718.212852] CPU: 28 PID: 20834 Comm: sh Kdump: loaded Tainted: G S      W IOE     5.17.0-rc8_nextqueue-devqueue-02643-g23f3121aca93 #1
[  718.219695] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0012.070720200218 07/07/2020
[  718.223418] Call Trace:
[  718.227139]
[  718.230783]  dump_stack_lvl+0x33/0x42
[  718.234431]  print_address_description.constprop.9+0x21/0x170
[  718.238177]  ? free_irq_cpu_rmap+0x53/0x80
[  718.241885]  ? free_irq_cpu_rmap+0x53/0x80
[  718.245539]  kasan_report.cold.18+0x7f/0x11b
[  718.249197]  ? free_irq_cpu_rmap+0x53/0x80
[  718.252852]  free_irq_cpu_rmap+0x53/0x80
[  718.256471]  ice_free_cpu_rx_rmap.part.11+0x37/0x50 [ice]
[  718.260174]  ice_remove_arfs+0x5f/0x70 [ice]
[  718.263810]  ice_rebuild_arfs+0x3b/0x70 [ice]
[  718.267419]  ice_rebuild+0x39c/0xb60 [ice]
[  718.270974]  ? asm_sysvec_apic_timer_interrupt+0x12/0x20
[  718.274472]  ? ice_init_phy_user_cfg+0x360/0x360 [ice]
[  718.278033]  ? delay_tsc+0x4a/0xb0
[  718.281513]  ? preempt_count_sub+0x14/0xc0
[  718.284984]  ? delay_tsc+0x8f/0xb0
[  718.288463]  ice_do_reset+0x92/0xf0 [ice]
[  718.292014]  ice_pci_err_resume+0x91/0xf0 [ice]
[  718.295561]  pci_reset_function+0x53/0x80
<...>
[  718.393035] Allocated by task 690:
[  718.433497] Freed by task 20834:
[  718.495688] Last potentially related work creation:
[  718.568966] The buggy address belongs to the object at ffff8881bd127e00
                which belongs to the cache kmalloc-96 of size 96
[  718.574085] The buggy address is located 0 bytes inside of
                96-byte region [ffff8881bd127e00, ffff8881bd127e60)
[  718.579265] The buggy address belongs to the page:
[  718.598905] Memory state around the buggy address:
[  718.601809]  ffff8881bd127d00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[  718.604796]  ffff8881bd127d80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
[  718.607794] >ffff8881bd127e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[  718.610811]                    ^
[  718.613819]  ffff8881bd127e80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
[  718.617107]  ffff8881bd127f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc

This is due to that free_irq_cpu_rmap() is always being called *after* (devm_)free_irq() and thus it tries to work with IRQ descs already freed. For example, on device reset the driver frees the rmap right before allocating a new one (the splat above). Make rmap creation and freeing function symmetrical with {request,free}_irq() calls i.e. do that on ifup/ifdown instead of device probe/remove/resume. These operations can be performed independently from the actual device aRFS configuration. Also, make sure ice_vsi_free_irq() clears IRQ affinity notifiers only when aRFS is disabled -- otherwise, CPU rmap sets and clears its own and they must not be touched manually.

---
 drivers/net/ethernet/intel/ice/ice_arfs.c |  9 ++-------
 drivers/net/ethernet/intel/ice/ice_lib.c  |  5 ++++-
 drivers/net/ethernet/intel/ice/ice_main.c | 20 ++++++++------------
 3 files changed, 14 insertions(+), 20 deletions(-)

index 632f16ffee40..085b1a0d67c5 100644
@@ -577,7 +577,7 @@ void ice_free_cpu_rx_rmap(struct ice_vsi *vsi)
 {
 	struct net_device *netdev;
 
-	if (!vsi || vsi->type != ICE_VSI_PF || !vsi->arfs_fltr_list)
+	if (!vsi || vsi->type != ICE_VSI_PF)
 		return;
 
 	netdev = vsi->netdev;

@@ -600,7 +600,7 @@ int ice_set_cpu_rx_rmap(struct ice_vsi *vsi)
 	int base_idx, i;
 
 	if (!vsi || vsi->type != ICE_VSI_PF)
-		return -EINVAL;
+		return 0;
 
 	pf = vsi->back;
 	netdev = vsi->netdev;

@@ -638,7 +638,6 @@ void ice_remove_arfs(struct ice_pf *pf)
 	if (!pf_vsi)
 		return;
 
-	ice_free_cpu_rx_rmap(pf_vsi);
 	ice_clear_arfs(pf_vsi);
 }
 

@@ -655,9 +654,5 @@ void ice_rebuild_arfs(struct ice_pf *pf)
 		return;
 
 	ice_remove_arfs(pf);
-	if (ice_set_cpu_rx_rmap(pf_vsi)) {
-		dev_err(ice_pf_to_dev(pf), "Failed to rebuild aRFS\n");
-		return;
-	}
 	ice_init_arfs(pf_vsi);
 }

index e99c8c10bc61..d3e5bf180c37 100644
@@ -2411,6 +2411,8 @@ void ice_vsi_free_irq(struct ice_vsi *vsi)
 		return;
 
 	vsi->irqs_ready = false;
+	ice_free_cpu_rx_rmap(vsi);
+
 	ice_for_each_q_vector(vsi, i) {
 		u16 vector = i + base;
 		int irq_num;

@@ -2424,7 +2426,8 @@ void ice_vsi_free_irq(struct ice_vsi *vsi)
 			continue;
 
 		/* clear the affinity notifier in the IRQ descriptor */
-		irq_set_affinity_notifier(irq_num, NULL);
+		if (!IS_ENABLED(CONFIG_RFS_ACCEL))
+			irq_set_affinity_notifier(irq_num, NULL);
 
 		/* clear the affinity_mask in the IRQ descriptor */
 		irq_set_affinity_hint(irq_num, NULL);

index 035bc90c8124..a337a6826a84 100644
@@ -2247,6 +2247,13 @@ static int ice_vsi_req_irq_msix(struct ice_vsi *vsi, char *basename)
 		irq_set_affinity_hint(irq_num, &q_vector->affinity_mask);
 	}
 
+	err = ice_set_cpu_rx_rmap(vsi);
+	if (err) {
+		netdev_err(vsi->netdev, "Failed to setup CPU RMAP on VSI %u: %pe\n",
+			   vsi->vsi_num, ERR_PTR(err));
+		goto free_q_irqs;
+	}
+
 	vsi->irqs_ready = true;
 	return 0;
 

@@ -3242,22 +3249,12 @@ static int ice_setup_pf_sw(struct ice_pf *pf)
 	 */
 	ice_napi_add(vsi);
 
-	status = ice_set_cpu_rx_rmap(vsi);
-	if (status) {
-		dev_err(ice_pf_to_dev(pf), "Failed to set CPU Rx map VSI %d error %d\n",
-			vsi->vsi_num, status);
-		status = -EINVAL;
-		goto unroll_napi_add;
-	}
 	status = ice_init_mac_fltr(pf);
 	if (status)
-		goto free_cpu_rx_map;
+		goto unroll_napi_add;
 
 	return status;
 
-free_cpu_rx_map:
-	ice_free_cpu_rx_rmap(vsi);
-
 unroll_napi_add:
 	if (vsi) {
 		ice_napi_del(vsi);

@@ -4598,7 +4595,6 @@ static int __maybe_unused ice_suspend(struct device *dev)
 			continue;
 		ice_vsi_free_q_vectors(pf->vsi[v]);
 	}
-	ice_free_cpu_rx_rmap(ice_get_main_vsi(pf));
 	ice_clear_interrupt_scheme(pf);
 
 	pci_save_state(pdev);

2.47.1