Subject: Re: [PATCH 1/5] ath9k: Fix use-after-free Read in htc_connect_service

From: Kalle Valo <[email-masked]>
Date: Tue, 7 Apr 2020 05:01:42 +0000 (UTC)

Qiujun Huang <[email-masked]> wrote:

> The skb is consumed by htc_send_epid, so it needn't release again.
> 
> The case reported by syzbot:
> 
> https://lore.kernel.org/linux-usb/[email-masked]
> usb 1-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
> usb 1-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size:
> 51008
> usb 1-1: Service connection timeout for: 256
> ==================================================================
> BUG: KASAN: use-after-free in atomic_read
> include/asm-generic/atomic-instrumented.h:26 [inline]
> BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:134
> [inline]
> BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1042
> [inline]
> BUG: KASAN: use-after-free in kfree_skb+0x32/0x3d0 net/core/skbuff.c:692
> Read of size 4 at addr ffff8881d0957994 by task kworker/1:2/83
> 
> Call Trace:
> kfree_skb+0x32/0x3d0 net/core/skbuff.c:692
> htc_connect_service.cold+0xa9/0x109
> drivers/net/wireless/ath/ath9k/htc_hst.c:282
> ath9k_wmi_connect+0xd2/0x1a0 drivers/net/wireless/ath/ath9k/wmi.c:265
> ath9k_init_htc_services.constprop.0+0xb4/0x650
> drivers/net/wireless/ath/ath9k/htc_drv_init.c:146
> ath9k_htc_probe_device+0x25a/0x1d80
> drivers/net/wireless/ath/ath9k/htc_drv_init.c:959
> ath9k_htc_hw_init+0x31/0x60
> drivers/net/wireless/ath/ath9k/htc_hst.c:501
> ath9k_hif_usb_firmware_cb+0x26b/0x500
> drivers/net/wireless/ath/ath9k/hif_usb.c:1187
> request_firmware_work_func+0x126/0x242
> drivers/base/firmware_loader/main.c:976
> process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
> worker_thread+0x96/0xe20 kernel/workqueue.c:2410
> kthread+0x318/0x420 kernel/kthread.c:255
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> 
> Allocated by task 83:
> kmem_cache_alloc_node+0xdc/0x330 mm/slub.c:2814
> __alloc_skb+0xba/0x5a0 net/core/skbuff.c:198
> alloc_skb include/linux/skbuff.h:1081 [inline]
> htc_connect_service+0x2cc/0x840
> drivers/net/wireless/ath/ath9k/htc_hst.c:257
> ath9k_wmi_connect+0xd2/0x1a0 drivers/net/wireless/ath/ath9k/wmi.c:265
> ath9k_init_htc_services.constprop.0+0xb4/0x650
> drivers/net/wireless/ath/ath9k/htc_drv_init.c:146
> ath9k_htc_probe_device+0x25a/0x1d80
> drivers/net/wireless/ath/ath9k/htc_drv_init.c:959
> ath9k_htc_hw_init+0x31/0x60
> drivers/net/wireless/ath/ath9k/htc_hst.c:501
> ath9k_hif_usb_firmware_cb+0x26b/0x500
> drivers/net/wireless/ath/ath9k/hif_usb.c:1187
> request_firmware_work_func+0x126/0x242
> drivers/base/firmware_loader/main.c:976
> process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
> worker_thread+0x96/0xe20 kernel/workqueue.c:2410
> kthread+0x318/0x420 kernel/kthread.c:255
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> 
> Freed by task 0:
> kfree_skb+0x102/0x3d0 net/core/skbuff.c:690
> ath9k_htc_txcompletion_cb+0x1f8/0x2b0
> drivers/net/wireless/ath/ath9k/htc_hst.c:356
> hif_usb_regout_cb+0x10b/0x1b0
> drivers/net/wireless/ath/ath9k/hif_usb.c:90
> __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
> __do_softirq+0x21e/0x950 kernel/softirq.c:292
> 
> Reported-and-tested-by: [email-masked]
> Signed-off-by: Qiujun Huang <[email-masked]>
> Signed-off-by: Kalle Valo <[email-masked]>

5 patches applied to ath-next branch of ath.git, thanks.

ced21a4c726b ath9k: Fix use-after-free Read in htc_connect_service
abeaa85054ff ath9k: Fix use-after-free Read in ath9k_wmi_ctrl_rx
e4ff08a4d727 ath9k: Fix use-after-free Write in ath9k_htc_rx_msg
19d6c375d671 ath9x: Fix stack-out-of-bounds Write in ath9k_hif_usb_rx_cb
2bbcaaee1fcb ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb

-- 
https://patchwork.kernel.org/patch/11474039/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches