> 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 among other things. > > As with other drivers that delay registration after probe, we track the > registration state in a flag variable and conidtionalize deregistration. > > Link: https://bugs.debian.org/1029116 > Link: https://bugs.kali.org/view.php?id=8140 > Reported-by: Stuart Hayhurst <stuart.a.hayhurst@xxxxxxxxx> > Fixes: 1c71e03afe4b ("mt76: mt7921: move mt7921_init_hw in a dedicated work") > Signed-off-by: Helmut Grohne <helmut@xxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Sponsored-by: Freexian and Offensive Security Hi Helmut, Thx for working on this. I would say it is a more general issue since we have dbdc support in mt7915/mt7996/mt7915 devices. I think we can move the check in mac80211.c, what do you think? Something like (please note this patch is not tested): diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c index b117e4467c87..34abf70f44af 100644 --- a/drivers/net/wireless/mediatek/mt76/mac80211.c +++ b/drivers/net/wireless/mediatek/mt76/mac80211.c @@ -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); diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 4ffb6be63571..38c311760d15 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -402,6 +402,7 @@ struct mt76_tx_cb { enum { MT76_STATE_INITIALIZED, + MT76_STATE_REGISTERED, MT76_STATE_RUNNING, MT76_STATE_MCU_RUNNING, MT76_SCANNING, Regards, Lorenzo > --- > drivers/net/wireless/mediatek/mt76/mt7921/init.c | 1 + > drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h | 1 + > drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 3 ++- > drivers/net/wireless/mediatek/mt76/mt7921/sdio.c | 3 ++- > drivers/net/wireless/mediatek/mt76/mt7921/usb.c | 3 ++- > 5 files changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c > index 542dfd425129..d5438212d5ff 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c > @@ -315,6 +315,7 @@ static void mt7921_init_work(struct work_struct *work) > dev_err(dev->mt76.dev, "register device failed\n"); > return; > } > + dev->hw_registered = true; > > ret = mt7921_init_debugfs(dev); > if (ret) { > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h > index 15d6b7fe1c6c..e3b5d8ebf243 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h > @@ -288,6 +288,7 @@ struct mt7921_dev { > bool hw_full_reset:1; > bool hw_init_done:1; > bool fw_assert:1; > + bool hw_registered:1; > > struct list_head sta_poll_list; > spinlock_t sta_poll_lock; > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > index cb72ded37256..1841eb7345dc 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c > @@ -110,7 +110,8 @@ static void mt7921e_unregister_device(struct mt7921_dev *dev) > struct mt76_connac_pm *pm = &dev->pm; > > cancel_work_sync(&dev->init_work); > - mt76_unregister_device(&dev->mt76); > + if (dev->hw_registered) > + mt76_unregister_device(&dev->mt76); > mt76_for_each_q_rx(&dev->mt76, i) > napi_disable(&dev->mt76.napi[i]); > cancel_delayed_work_sync(&pm->ps_work); > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c > index 8ce4252b8ae7..23a9dd3c6450 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c > @@ -43,7 +43,8 @@ static void mt7921s_unregister_device(struct mt7921_dev *dev) > struct mt76_connac_pm *pm = &dev->pm; > > cancel_work_sync(&dev->init_work); > - mt76_unregister_device(&dev->mt76); > + if (dev->hw_registered) > + mt76_unregister_device(&dev->mt76); > cancel_delayed_work_sync(&pm->ps_work); > cancel_work_sync(&pm->wake_work); > > diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c > index 5321d20dcdcb..e55e1b50f760 100644 > --- a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c > +++ b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c > @@ -301,7 +301,8 @@ static void mt7921u_disconnect(struct usb_interface *usb_intf) > if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state)) > return; > > - mt76_unregister_device(&dev->mt76); > + if (dev->hw_registered) > + mt76_unregister_device(&dev->mt76); > mt7921u_cleanup(dev); > > usb_set_intfdata(usb_intf, NULL); > -- > 2.39.0 > >
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