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From: Alan Stern <stern@rowland.harvard.edu>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Jiri Kosina <jikos@kernel.org>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Hillf Danton <hdanton@sina.com>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	<linux-input@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>
Subject: Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver
Date: Thu, 22 Aug 2019 13:11:37 -0400 (EDT)
Message-ID: <Pine.LNX.4.44L0.1908221253180.1311-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <CAAeHK+zarjL9AWcOTMMfMgE7+vk8W2HQTvjR1x3n6H6QPYC1aQ@mail.gmail.com>

On Thu, 22 Aug 2019, Andrey Konovalov wrote:

> Hi Alan,
> 
> I've ran the fuzzer with your patches applied overnight and noticed
> another fallout of similar bugs. I think they are caused by a similar
> issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> look like a bug to you?

It looks like the relevant hid_hw_stop() call is the one at the end of
sony_configure_input().  But I can't tell if doing that way is valid or
not -- in practice the code would end up calling hid_disconnect() while
hid_connect() was still running, which doesn't seem like a good idea.

There's a comment about this near the end of sony_probe().  I suspect
it would be better to call hid_hw_stop() in the conditional code
following that comment rather than in sony_configure_input().

Either way, these are all things Jiri should know about or check up on.

Have you gotten any test results from syzbot exercising these pathways?  
You ought to be able to tell which HID driver is involved by looking
through the console output.

Alan Stern


  reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29 11:48 WARNING in usbhid_raw_request/usb_submit_urb 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 [this message]
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

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