Re: [PATCH v2] wifi: ar5523: enable proper endpoint verification

[Kalle Valo]

Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx> wrote:

> Syzkaller reports [1] hitting a warning about an endpoint in use
> not having an expected type to it.
> 
> Fix the issue by checking for the existence of all proper
> endpoints with their according types intact.
> 
> Sadly, this patch has not been tested on real hardware.
> 
> [1] Syzkaller report:
> ------------[ cut here ]------------
> usb 1-1: BOGUS urb xfer, pipe 3 != type 1
> WARNING: CPU: 0 PID: 3643 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504
> ...
> Call Trace:
>  <TASK>
>  ar5523_cmd+0x41b/0x780 drivers/net/wireless/ath/ar5523/ar5523.c:275
>  ar5523_cmd_read drivers/net/wireless/ath/ar5523/ar5523.c:302 [inline]
>  ar5523_host_available drivers/net/wireless/ath/ar5523/ar5523.c:1376 [inline]
>  ar5523_probe+0x14b0/0x1d10 drivers/net/wireless/ath/ar5523/ar5523.c:1655
>  usb_probe_interface+0x30f/0x7f0 drivers/usb/core/driver.c:396
>  call_driver_probe drivers/base/dd.c:560 [inline]
>  really_probe+0x249/0xb90 drivers/base/dd.c:639
>  __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778
>  driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808
>  __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:936
>  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:427
>  __device_attach+0x1e4/0x530 drivers/base/dd.c:1008
>  bus_probe_device+0x1e8/0x2a0 drivers/base/bus.c:487
>  device_add+0xbd9/0x1e90 drivers/base/core.c:3517
>  usb_set_configuration+0x101d/0x1900 drivers/usb/core/message.c:2170
>  usb_generic_driver_probe+0xbe/0x100 drivers/usb/core/generic.c:238
>  usb_probe_device+0xd8/0x2c0 drivers/usb/core/driver.c:293
>  call_driver_probe drivers/base/dd.c:560 [inline]
>  really_probe+0x249/0xb90 drivers/base/dd.c:639
>  __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778
>  driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808
>  __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:936
>  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:427
>  __device_attach+0x1e4/0x530 drivers/base/dd.c:1008
>  bus_probe_device+0x1e8/0x2a0 drivers/base/bus.c:487
>  device_add+0xbd9/0x1e90 drivers/base/core.c:3517
>  usb_new_device.cold+0x685/0x10ad drivers/usb/core/hub.c:2573
>  hub_port_connect drivers/usb/core/hub.c:5353 [inline]
>  hub_port_connect_change drivers/usb/core/hub.c:5497 [inline]
>  port_event drivers/usb/core/hub.c:5653 [inline]
>  hub_event+0x26cb/0x45d0 drivers/usb/core/hub.c:5735
>  process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
>  worker_thread+0x669/0x1090 kernel/workqueue.c:2436
>  kthread+0x2e8/0x3a0 kernel/kthread.c:376
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
>  </TASK>
> 
> Reported-and-tested-by: syzbot+1bc2c2afd44f820a669f@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: b7d572e1871d ("ar5523: Add new driver")
> Signed-off-by: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>

Does anyone have a real device to test this? I have had so much problems with
syzbot fixes in the past that I'm hesitant to take such patches without
testing.

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20240408121425.29392-1-n.zhandarovich@xxxxxxxxxx/

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