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wifi: mt76: mt7615: do not tear down BSS/STA state for monitor vifs

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Tearing down a monitor interface oopses:

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  RIP: 0010:mt76_connac_mcu_uni_add_bss+0x144/0x370 [mt76_connac_lib]
  Call Trace:
   mt7615_remove_interface+0x6a/0x200 [mt7615_common]
   drv_remove_interface+0x60/0x140 [mac80211]
   ieee80211_del_virtual_monitor+0x8f/0xc0 [mac80211]
   ieee80211_do_open+0x550/0x7d0 [mac80211]
   ieee80211_open+0xaa/0xb0 [mac80211]
   __dev_open+0x11b/0x280

mt7615_remove_interface() tears down BSS and STA state for every vif type.
On MT7663 with offload firmware that reaches mt76_connac_mcu_uni_add_bss(),
which has no monitor case in its iftype switch. It takes WARN_ON(1), then
copies ETH_ALEN from vif->bss_conf.bssid, which is NULL for a monitor vif.

mt76_connac_mcu_bss_basic_tlv() in the same file handles this. It has an
NL80211_IFTYPE_MONITOR case and it copies phy->macaddr in place of the
bssid. The uni variant has neither.

There is nothing to tear down. mt7615_add_interface() only calls
mt7615_mcu_add_dev_info(). The BSS and STA state comes from beacon enable
in mt7615_bss_info_changed(), from mt7615_set_key() and from
mt7615_mac_sta_add(), so a monitor vif never has any.

Reported on mt7615e going from monitor back to managed, and on mt7663u on
an "ip link set down", both through ieee80211_del_virtual_monitor().

Fixes: d9852ab2f362 ("mt76: mt7615: keep mcu_add_bss_info enabled till interface removal")
Cc: [email protected]
Reported-by: Orly Orge <[email protected]>
Closes: https://lore.kernel.org/linux-wireless/CANj5C4mTOHs6riyWee=dFdkE5p=714J8xs-x3hq3ewQ+r6O_Nw@mail.gmail.com/
Reported-by: Inanix <[email protected]>
Closes: https://github.com/morrownr/mt76/issues/79
Tested-by: Inanix <[email protected]>
Signed-off-by: Mark Anthony Agarro <[email protected]>
Signed-off-by: Devin Wittmayer <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Mark Anthony Agarro
2026-09-01 13:25:05 +02:00
committed by Felix Fietkau
parent a57185c5b6
commit be5ce79105
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mt7615/main.c
+2
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@@ -254,8 +254,10 @@ static void mt7615_remove_interface(struct ieee80211_hw *hw,
mt7615_mutex_acquire(dev); mt7615_mutex_acquire(dev);
if (vif->type != NL80211_IFTYPE_MONITOR) {
mt7615_mcu_add_bss_info(phy, vif, NULL, false); mt7615_mcu_add_bss_info(phy, vif, NULL, false);
mt7615_mcu_sta_add(phy, vif, NULL, false); mt7615_mcu_sta_add(phy, vif, NULL, false);
}
mt76_testmode_reset(phy->mt76, true); mt76_testmode_reset(phy->mt76, true);
if (vif == phy->monitor_vif) if (vif == phy->monitor_vif)