Merge tag 'wireless-2026-09-16' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless

Johannes Berg says:

====================
Many fixes:
 - mac80211: S1G TIM bitmap fix
 - ath12k: remove undocumented DT ABI implementation
 - various firmware API and over-the-air hardening changes
 - fixes for most cfg80211/mac80211 syzbot reports

* tag 'wireless-2026-09-16' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless: (67 commits)
  wifi: brcmsmac: fix UAF in brcms_free_timer()
  wifi: brcmfmac: fix lost 802.1x TX completion wakeup
  wifi: ath11k: cleanup arsta in ath11k_mac_peer_cleanup_all()
  wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown
  wifi: ath12k: ahb: Revert undocumented ABI and dead code
  wifi: mac80211: refuse to make a monitor active when it has no queue
  wifi: libipw: reject TKIP frames without a full MIC
  wifi: virt_wifi: don't transfer operstate before register
  wifi: cfg80211: check if AP has been started or joined a mesh before adding new station
  wifi: cfg80211: move link_id validation earlier in nl80211_new_station()
  wifi: cfg80211: do not support direct add of station to AP_VLAN interfaces
  wifi: cfg80211: verify if AP_VLAN belongs to the correct AP
  wifi: mac80211: set up the TX info early to fix failure paths
  wifi: mac80211: mesh: release the channel if start fails
  wifi: mac80211: mesh: reset the CSA state when leaving
  wifi: mac80211: add HE 6 GHz capability in the scan elems len
  wifi: mac80211: don't access the TSF of a down interface
  wifi: mac80211: don't RCU-dereference the mesh CSA settings we just set
  wifi: mac80211: don't allow link changes when iface is down
  wifi: mac80211: require a peer station for TDLS setup confirm
  ...
====================

Link: https://patch.msgid.link/20260916083642.110609-3-johannes@sipsolutions.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index f3c6a41e4911..6aba22493670 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -657,6 +657,9 @@ static ssize_t ieee80211_if_fmt_tsf(
 	struct ieee80211_local *local = sdata->local;
 	u64 tsf;
 
+	if (!ieee80211_sdata_running((struct ieee80211_sub_if_data *)sdata))
+		return -ENETDOWN;
+
 	tsf = drv_get_tsf(local, (struct ieee80211_sub_if_data *)sdata);
 
 	return scnprintf(buf, buflen, "0x%016llx\n", (unsigned long long) tsf);
@@ -670,6 +673,9 @@ static ssize_t ieee80211_if_parse_tsf(
 	int ret;
 	int tsf_is_delta = 0;
 
+	if (!ieee80211_sdata_running(sdata))
+		return -ENETDOWN;
+
 	if (strncmp(buf, "reset", 5) == 0) {
 		if (local->ops->reset_tsf) {
 			drv_reset_tsf(local, sdata);
@@ -729,6 +735,9 @@ static ssize_t ieee80211_if_parse_active_links(struct ieee80211_sub_if_data *sda
 	if (kstrtou16(buf, 0, &active_links) || !active_links)
 		return -EINVAL;
 
+	if (!ieee80211_sdata_running(sdata))
+		return -ENETDOWN;
+
 	return ieee80211_set_active_links(&sdata->vif, active_links) ?: buflen;
 }
 IEEE80211_IF_FILE_RW(active_links);