6.15-stable review patch. If anyone has any objections, please let me know.
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From: Rameshkumar Sundaram rameshkumar.sundaram@oss.qualcomm.com
[ Upstream commit 36670b67de18f1e5d34900c5d2ac60a8970c293c ]
During beacon miss handling, ath12k driver iterates over active virtual interfaces (vifs) and attempts to access the radio object (ar) via arvif->deflink->ar.
However, after commit aa80f12f3bed ("wifi: ath12k: defer vdev creation for MLO"), arvif is linked to a radio only after vdev creation, typically when a channel is assigned or a scan is requested. For P2P capable devices, a default P2P interface is created by wpa_supplicant along with regular station interfaces, these serve as dummy interfaces for P2P-capable stations, lack an associated netdev and initiate frequent scans to discover neighbor p2p devices. When a scan is initiated on such P2P vifs, driver selects destination radio (ar) based on scan frequency, creates a scan vdev, and attaches arvif to the radio. Once the scan completes or is aborted, the scan vdev is deleted, detaching arvif from the radio and leaving arvif->ar uninitialized.
While handling beacon miss for station interfaces, P2P interface is also encountered in the vif iteration and ath12k_mac_handle_beacon_miss_iter() tries to dereference the uninitialized arvif->deflink->ar.
Fix this by verifying that vdev is created for the arvif before accessing its ar during beacon miss handling and similar vif iterator callbacks.
========================================================================== wlp6s0: detected beacon loss from AP (missed 7 beacons) - probing KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 5 UID: 0 PID: 0 Comm: swapper/5 Not tainted 6.16.0-rc1-wt-ath+ #2 PREEMPT(full) RIP: 0010:ath12k_mac_handle_beacon_miss_iter+0xb5/0x1a0 [ath12k] Call Trace: __iterate_interfaces+0x11a/0x410 [mac80211] ieee80211_iterate_active_interfaces_atomic+0x61/0x140 [mac80211] ath12k_mac_handle_beacon_miss+0xa1/0xf0 [ath12k] ath12k_roam_event+0x393/0x560 [ath12k] ath12k_wmi_op_rx+0x1486/0x28c0 [ath12k] ath12k_htc_process_trailer.isra.0+0x2fb/0x620 [ath12k] ath12k_htc_rx_completion_handler+0x448/0x830 [ath12k] ath12k_ce_recv_process_cb+0x549/0x9e0 [ath12k] ath12k_ce_per_engine_service+0xbe/0xf0 [ath12k] ath12k_pci_ce_workqueue+0x69/0x120 [ath12k] process_one_work+0xe3a/0x1430
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Fixes: aa80f12f3bed ("wifi: ath12k: defer vdev creation for MLO") Signed-off-by: Rameshkumar Sundaram rameshkumar.sundaram@oss.qualcomm.com Reviewed-by: Vasanthakumar Thiagarajan vasanthakumar.thiagarajan@oss.qualcomm.com Link: https://patch.msgid.link/20250618185635.750470-1-rameshkumar.sundaram@oss.qu... Signed-off-by: Jeff Johnson jeff.johnson@oss.qualcomm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/ath/ath12k/mac.c | 15 +++++++++------ drivers/net/wireless/ath/ath12k/p2p.c | 3 ++- 2 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index d1d3c9f34372..7333ca58d541 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -685,6 +685,9 @@ static void ath12k_get_arvif_iter(void *data, u8 *mac, if (WARN_ON(!arvif)) continue;
+ if (!arvif->is_created) + continue; + if (arvif->vdev_id == arvif_iter->vdev_id && arvif->ar == arvif_iter->ar) { arvif_iter->arvif = arvif; @@ -1844,7 +1847,7 @@ static void ath12k_mac_handle_beacon_iter(void *data, u8 *mac, struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif); struct ath12k_link_vif *arvif = &ahvif->deflink;
- if (vif->type != NL80211_IFTYPE_STATION) + if (vif->type != NL80211_IFTYPE_STATION || !arvif->is_created) return;
if (!ether_addr_equal(mgmt->bssid, vif->bss_conf.bssid)) @@ -1867,16 +1870,16 @@ static void ath12k_mac_handle_beacon_miss_iter(void *data, u8 *mac, u32 *vdev_id = data; struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif); struct ath12k_link_vif *arvif = &ahvif->deflink; - struct ath12k *ar = arvif->ar; - struct ieee80211_hw *hw = ath12k_ar_to_hw(ar); + struct ieee80211_hw *hw;
- if (arvif->vdev_id != *vdev_id) + if (!arvif->is_created || arvif->vdev_id != *vdev_id) return;
if (!arvif->is_up) return;
ieee80211_beacon_loss(vif); + hw = ath12k_ar_to_hw(arvif->ar);
/* Firmware doesn't report beacon loss events repeatedly. If AP probe * (done by mac80211) succeeds but beacons do not resume then it @@ -9165,7 +9168,7 @@ ath12k_mac_change_chanctx_cnt_iter(void *data, u8 *mac, if (WARN_ON(!arvif)) continue;
- if (arvif->ar != arg->ar) + if (!arvif->is_created || arvif->ar != arg->ar) continue;
link_conf = wiphy_dereference(ahvif->ah->hw->wiphy, @@ -9200,7 +9203,7 @@ ath12k_mac_change_chanctx_fill_iter(void *data, u8 *mac, if (WARN_ON(!arvif)) continue;
- if (arvif->ar != arg->ar) + if (!arvif->is_created || arvif->ar != arg->ar) continue;
link_conf = wiphy_dereference(ahvif->ah->hw->wiphy, diff --git a/drivers/net/wireless/ath/ath12k/p2p.c b/drivers/net/wireless/ath/ath12k/p2p.c index 84cccf7d91e7..59589748f1a8 100644 --- a/drivers/net/wireless/ath/ath12k/p2p.c +++ b/drivers/net/wireless/ath/ath12k/p2p.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: BSD-3-Clause-Clear /* * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. */
#include <net/mac80211.h> @@ -124,7 +125,7 @@ static void ath12k_p2p_noa_update_vdev_iter(void *data, u8 *mac,
WARN_ON(!rcu_read_lock_any_held()); arvif = &ahvif->deflink; - if (arvif->ar != arg->ar || arvif->vdev_id != arg->vdev_id) + if (!arvif->is_created || arvif->ar != arg->ar || arvif->vdev_id != arg->vdev_id) return;
ath12k_p2p_noa_update(arvif, arg->noa);