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From: Oliver Neukum <oneukum@suse.com>
To: Hillf Danton <hdanton@sina.com>,
	syzbot <syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com>
Cc: gustavo@embeddedor.com, Jiri Slaby <jirislaby@gmail.com>,
	andreyknvl@google.com, syzkaller-bugs@googlegroups.com,
	gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
	Jiri Kosina <jkosina@suse.cz>,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-usb@vger.kernel.org
Subject: Re: WARNING in usbhid_raw_request/usb_submit_urb
Date: Tue, 13 Aug 2019 10:14:54 +0200
Message-ID: <1565684094.7043.3.camel@suse.com> (raw)
In-Reply-To: <20190813042649.888-1-hdanton@sina.com>

Am Dienstag, den 13.08.2019, 12:26 +0800 schrieb Hillf Danton:
> [respin with the mess in Cc list cleaned up]

> Followup of commit e3e14de50dff ("HID: fix start/stop cycle in usbhid driver")
> 
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -1214,6 +1214,8 @@ static void usbhid_stop(struct hid_devic
>  
>  	hid->claimed = 0;
>  
> +	if (!usbhid->urbin) /* freeing buffers only once */
> +		return;
>  	usb_free_urb(usbhid->urbin);
>  	usb_free_urb(usbhid->urbctrl);
>  	usb_free_urb(usbhid->urbout);

This looks rather suspicious. Why is stop() called multiple times?
Do we have a refcounting issue? If not, what controls locking?

	Regards
		Oliver


      parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29 11:48 syzbot
2019-07-30 14:10 ` Alan Stern
2019-07-30 14:12   ` Andrey Konovalov
2019-07-30 14:24     ` Oliver Neukum
2019-07-30 16:58 ` syzbot
2019-08-12 12:46   ` Andrey Konovalov
2019-08-12 13:03     ` syzbot
2019-08-12 14:23       ` Andrey Konovalov
2019-08-13 20:13       ` Alan Stern
2019-08-21 12:51         ` Andrey Konovalov
2019-08-21 13:09           ` syzbot
2019-08-21 14:08             ` Andrey Konovalov
     [not found]     ` <20190812144720.1980-1-hdanton@sina.com>
2019-08-12 14:55       ` Andrey Konovalov
2019-08-12 15:06       ` general protection fault in __pm_runtime_resume syzbot
2019-08-15 17:43         ` Alan Stern
2019-08-20 20:00           ` [PATCH] HID: USB: Fix general protection fault caused by Logitech driver Alan Stern
2019-08-21 14:11             ` Andrey Konovalov
2019-08-22  7:53             ` Jiri Kosina
2019-08-22 12:32             ` Andrey Konovalov
2019-08-22 17:11               ` Alan Stern
2019-08-22 18:25                 ` Andrey Konovalov
2019-08-22 20:21                   ` Alan Stern
2019-08-23  9:29                     ` Jiri Kosina
2019-08-24  0:41                       ` Roderick.Colenbrander
2019-09-03 10:46                         ` Andrey Konovalov
2019-09-03 20:00                           ` Roderick.Colenbrander
     [not found]     ` <20190813042649.888-1-hdanton@sina.com>
2019-08-13  7:35       ` WARNING in usbhid_raw_request/usb_submit_urb Dmitry Vyukov
2019-08-13  8:14       ` Oliver Neukum [this message]

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