From: Qiujun Huang <hqjagain@xxxxxxxxx> commit abeaa85054ff8cfe8b99aafc5c70ea067e5d0908 upstream. Free wmi later after cmd urb has been killed, as urb cb will access wmi. the case reported by syzbot: https://lore.kernel.org/linux-usb/0000000000000002fc05a1d61a68@xxxxxxxxxx BUG: KASAN: use-after-free in ath9k_wmi_ctrl_rx+0x416/0x500 drivers/net/wireless/ath/ath9k/wmi.c:215 Read of size 1 at addr ffff8881cef1417c by task swapper/1/0 Call Trace: <IRQ> ath9k_wmi_ctrl_rx+0x416/0x500 drivers/net/wireless/ath/ath9k/wmi.c:215 ath9k_htc_rx_msg+0x2da/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:459 ath9k_hif_usb_reg_in_cb+0x1ba/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:718 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786 Reported-and-tested-by: syzbot+5d338854440137ea0fef@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Qiujun Huang <hqjagain@xxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200404041838.10426-3-hqjagain@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/wireless/ath/ath9k/hif_usb.c | 5 +++-- drivers/net/wireless/ath/ath9k/hif_usb.h | 1 + drivers/net/wireless/ath/ath9k/htc_drv_init.c | 10 +++++++--- drivers/net/wireless/ath/ath9k/wmi.c | 5 ++++- drivers/net/wireless/ath/ath9k/wmi.h | 3 ++- 5 files changed, 17 insertions(+), 7 deletions(-) --- a/drivers/net/wireless/ath/ath9k/hif_usb.c +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c @@ -971,7 +971,7 @@ err: return -ENOMEM; } -static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev) +void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev) { usb_kill_anchored_urbs(&hif_dev->regout_submitted); ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev); @@ -1339,8 +1339,9 @@ static void ath9k_hif_usb_disconnect(str if (hif_dev->flags & HIF_USB_READY) { ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged); - ath9k_htc_hw_free(hif_dev->htc_handle); ath9k_hif_usb_dev_deinit(hif_dev); + ath9k_destoy_wmi(hif_dev->htc_handle->drv_priv); + ath9k_htc_hw_free(hif_dev->htc_handle); } usb_set_intfdata(interface, NULL); --- a/drivers/net/wireless/ath/ath9k/hif_usb.h +++ b/drivers/net/wireless/ath/ath9k/hif_usb.h @@ -133,5 +133,6 @@ struct hif_device_usb { int ath9k_hif_usb_init(void); void ath9k_hif_usb_exit(void); +void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev); #endif /* HTC_USB_H */ --- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c @@ -933,8 +933,9 @@ err_init: int ath9k_htc_probe_device(struct htc_target *htc_handle, struct device *dev, u16 devid, char *product, u32 drv_info) { - struct ieee80211_hw *hw; + struct hif_device_usb *hif_dev; struct ath9k_htc_priv *priv; + struct ieee80211_hw *hw; int ret; hw = ieee80211_alloc_hw(sizeof(struct ath9k_htc_priv), &ath9k_htc_ops); @@ -969,7 +970,10 @@ int ath9k_htc_probe_device(struct htc_ta return 0; err_init: - ath9k_deinit_wmi(priv); + ath9k_stop_wmi(priv); + hif_dev = (struct hif_device_usb *)htc_handle->hif_dev; + ath9k_hif_usb_dealloc_urbs(hif_dev); + ath9k_destoy_wmi(priv); err_free: ieee80211_free_hw(hw); return ret; @@ -984,7 +988,7 @@ void ath9k_htc_disconnect_device(struct htc_handle->drv_priv->ah->ah_flags |= AH_UNPLUGGED; ath9k_deinit_device(htc_handle->drv_priv); - ath9k_deinit_wmi(htc_handle->drv_priv); + ath9k_stop_wmi(htc_handle->drv_priv); ieee80211_free_hw(htc_handle->drv_priv->hw); } } --- a/drivers/net/wireless/ath/ath9k/wmi.c +++ b/drivers/net/wireless/ath/ath9k/wmi.c @@ -112,14 +112,17 @@ struct wmi *ath9k_init_wmi(struct ath9k_ return wmi; } -void ath9k_deinit_wmi(struct ath9k_htc_priv *priv) +void ath9k_stop_wmi(struct ath9k_htc_priv *priv) { struct wmi *wmi = priv->wmi; mutex_lock(&wmi->op_mutex); wmi->stopped = true; mutex_unlock(&wmi->op_mutex); +} +void ath9k_destoy_wmi(struct ath9k_htc_priv *priv) +{ kfree(priv->wmi); } --- a/drivers/net/wireless/ath/ath9k/wmi.h +++ b/drivers/net/wireless/ath/ath9k/wmi.h @@ -179,7 +179,6 @@ struct wmi { }; struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv); -void ath9k_deinit_wmi(struct ath9k_htc_priv *priv); int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi, enum htc_endpoint_id *wmi_ctrl_epid); int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id, @@ -189,6 +188,8 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum void ath9k_wmi_event_tasklet(unsigned long data); void ath9k_fatal_work(struct work_struct *work); void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv); +void ath9k_stop_wmi(struct ath9k_htc_priv *priv); +void ath9k_destoy_wmi(struct ath9k_htc_priv *priv); #define WMI_CMD(_wmi_cmd) \ do { \
