| Message ID | 20250416021724.2162519-1-maharaja.kennadyrajan@oss.qualcomm.com |
|---|---|
| State | New |
| Headers | show |
| Series | [ath-next] wifi: ath12k: fix node corruption in ar->arvifs list | expand |
On Wed, 16 Apr 2025 07:47:24 +0530, Maharaja Kennadyrajan wrote: > In current WLAN recovery code flow, ath12k_core_halt() only reinitializes > the "arvifs" list head. This will cause the list node immediately following > the list head to become an invalid list node. Because the prev of that node > still points to the list head "arvifs", but the next of the list head > "arvifs" no longer points to that list node. > > When a WLAN recovery occurs during the execution of a vif removal, and it > happens before the spin_lock_bh(&ar->data_lock) in > ath12k_mac_vdev_delete(), list_del() will detect the previously mentioned > situation, thereby triggering a kernel panic. > > [...] Applied, thanks! [1/1] wifi: ath12k: fix node corruption in ar->arvifs list commit: 823435bd23108d6f8be89ea2d025c0e2e3769c51 Best regards,
diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c index b501d722df31..7eccd9cf9036 100644 --- a/drivers/net/wireless/ath/ath12k/core.c +++ b/drivers/net/wireless/ath/ath12k/core.c @@ -1371,6 +1371,7 @@ static void ath12k_rfkill_work(struct work_struct *work) void ath12k_core_halt(struct ath12k *ar) { + struct list_head *pos, *n; struct ath12k_base *ab = ar->ab; lockdep_assert_wiphy(ath12k_ar_to_hw(ar)->wiphy); @@ -1387,7 +1388,12 @@ void ath12k_core_halt(struct ath12k *ar) rcu_assign_pointer(ab->pdevs_active[ar->pdev_idx], NULL); synchronize_rcu(); - INIT_LIST_HEAD(&ar->arvifs); + + spin_lock_bh(&ar->data_lock); + list_for_each_safe(pos, n, &ar->arvifs) + list_del_init(pos); + spin_unlock_bh(&ar->data_lock); + idr_init(&ar->txmgmt_idr); }
In current WLAN recovery code flow, ath12k_core_halt() only reinitializes the "arvifs" list head. This will cause the list node immediately following the list head to become an invalid list node. Because the prev of that node still points to the list head "arvifs", but the next of the list head "arvifs" no longer points to that list node. When a WLAN recovery occurs during the execution of a vif removal, and it happens before the spin_lock_bh(&ar->data_lock) in ath12k_mac_vdev_delete(), list_del() will detect the previously mentioned situation, thereby triggering a kernel panic. The fix is to remove and reinitialize all vif list nodes from the list head "arvifs" during WLAN halt. The reinitialization is to make the list nodes valid, ensuring that the list_del() in ath12k_mac_vdev_delete() can execute normally. Call trace: __list_del_entry_valid_or_report+0xd4/0x100 (P) ath12k_mac_remove_link_interface.isra.0+0xf8/0x2e4 [ath12k] ath12k_scan_vdev_clean_work+0x40/0x164 [ath12k] cfg80211_wiphy_work+0xfc/0x100 process_one_work+0x164/0x2d0 worker_thread+0x254/0x380 kthread+0xfc/0x100 ret_from_fork+0x10/0x20 The change is mostly copied from the ath11k patch: https://lore.kernel.org/all/20250320053145.3445187-1-quic_stonez@quicinc.com/ Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1 Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") Signed-off-by: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com> --- drivers/net/wireless/ath/ath12k/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) base-commit: 176f3009ae598d0523b267db319fe16f69577231