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wifi: mt76: do not run mt76_unregister_device() on unregistered hw

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Trying to probe a mt7921e pci card without firmware results in a
successful probe where ieee80211_register_hw hasn't been called. When
removing the driver, ieee802111_unregister_hw is called unconditionally
leading to a kernel NULL pointer dereference.
Fix the issue running mt76_unregister_device routine just for registered
hw.

Link: https://bugs.debian.org/1029116
Link: https://bugs.kali.org/view.php?id=8140
Reported-by: Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
Fixes: 1c71e03afe4b ("mt76: mt7921: move mt7921_init_hw in a dedicated work")
Tested-by: Helmut Grohne <helmut@freexian.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/be3457d82f4e44bb71a22b2b5db27b644a37b1e1.1677107277.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2023-02-23 00:10:25 +01:00 committed by Kalle Valo
parent 96c0695083
commit 41130c32f3
2 changed files with 9 additions and 0 deletions
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8
drivers/net/wireless/mediatek/mt76/mac80211.c
View File

@ -539,6 +539,7 @@ int mt76_register_phy(struct mt76_phy *phy, bool vht,
if (ret)
return ret;
set_bit(MT76_STATE_REGISTERED, &phy->state);
phy->dev->phys[phy->band_idx] = phy;
return 0;
@ -549,6 +550,9 @@ void mt76_unregister_phy(struct mt76_phy *phy)
{
struct mt76_dev *dev = phy->dev;
if (!test_bit(MT76_STATE_REGISTERED, &phy->state))
return;
if (IS_ENABLED(CONFIG_MT76_LEDS))
mt76_led_cleanup(phy);
mt76_tx_status_check(dev, true);
@ -719,6 +723,7 @@ int mt76_register_device(struct mt76_dev *dev, bool vht,
return ret;
WARN_ON(mt76_worker_setup(hw, &dev->tx_worker, NULL, "tx"));
set_bit(MT76_STATE_REGISTERED, &phy->state);
sched_set_fifo_low(dev->tx_worker.task);
return 0;
@ -729,6 +734,9 @@ void mt76_unregister_device(struct mt76_dev *dev)
{
struct ieee80211_hw *hw = dev->hw;
if (!test_bit(MT76_STATE_REGISTERED, &dev->phy.state))
return;
if (IS_ENABLED(CONFIG_MT76_LEDS))
mt76_led_cleanup(&dev->phy);
mt76_tx_status_check(dev, true);

1
drivers/net/wireless/mediatek/mt76/mt76.h
View File

@ -402,6 +402,7 @@ struct mt76_tx_cb {
enum {
MT76_STATE_INITIALIZED,
MT76_STATE_REGISTERED,
MT76_STATE_RUNNING,
MT76_STATE_MCU_RUNNING,
MT76_SCANNING,