Re: [PATCH v3] ar5523: check endpoints type and direction in probe()

Mazin Al Haddad [off-list ref] writes:

Fixes a bug reported by syzbot, where a warning occurs in usb_submit_urb()
due to the wrong endpoint type. There is no check for both the number
of endpoints and the type.

Fix it by adding a check for the number of endpoints and the
direction/type of the endpoints. If the endpoints do not match -ENODEV is
returned.

usb 1-1: BOGUS urb xfer, pipe 3 != type 1
WARNING: CPU: 1 PID: 71 at drivers/usb/core/urb.c:502 usb_submit_urb+0xed2/0x18a0 drivers/usb/core/urb.c:502
Modules linked in:
CPU: 1 PID: 71 Comm: kworker/1:2 Not tainted 5.19.0-rc7-syzkaller-00150-g32f02a211b0a #0
Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 ar5523_cmd+0x420/0x790 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+0xc66/0x1da0 drivers/net/wireless/ath/ar5523/ar5523.c:1655

Link: https://syzkaller.appspot.com/bug?extid=1bc2c2afd44f820a669f
Reported-and-tested-by: syzbot+1bc2c2afd44f820a669f@syzkaller.appspotmail.com
Signed-off-by: Mazin Al Haddad <redacted>

Has this been tested on a real ar5523 hardware?

-- 
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