wifi: ath11k: fix gtk offload status event locking

commit 1dea3c0720a146bd7193969f2847ccfed5be2221 upstream.

The ath11k active pdevs are protected by RCU but the gtk offload status
event handling code calling ath11k_mac_get_arvif_by_vdev_id() was not
marked as a read-side critical section.

Mark the code in question as an RCU read-side critical section to avoid
any potential use-after-free issues.

Compile tested only.

Fixes: a16d9b50cfba ("ath11k: support GTK rekey offload")
Cc: stable@vger.kernel.org      # 5.18
Cc: Carl Huang <quic_cjhuang@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231019155342.31631-1-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index 333aff5..1c07f55 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -8619,12 +8619,13 @@ static void ath11k_wmi_gtk_offload_status_event(struct ath11k_base *ab,
                return;
        }
 
+       rcu_read_lock();
+
        arvif = ath11k_mac_get_arvif_by_vdev_id(ab, ev->vdev_id);
        if (!arvif) {
                ath11k_warn(ab, "failed to get arvif for vdev_id:%d\n",
                            ev->vdev_id);
-               kfree(tb);
-               return;
+               goto exit;
        }
 
        ath11k_dbg(ab, ATH11K_DBG_WMI, "event gtk offload refresh_cnt %d\n",
@@ -8641,6 +8642,8 @@ static void ath11k_wmi_gtk_offload_status_event(struct ath11k_base *ab,
 
        ieee80211_gtk_rekey_notify(arvif->vif, arvif->bssid,
                                   (void *)&replay_ctr_be, GFP_ATOMIC);
+exit:
+       rcu_read_unlock();
 
        kfree(tb);
 }