linux-kernel - Re: [BUG] USB input death then system freeze

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Date:	Fri, 25 May 2007 11:52:09 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Nicolas Mailhot <nicolas.mailhot@...oste.net>
cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-usb-devel@...ts.sourceforge.net, Zan Lynx <zlynx@....org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [BUG] USB input death then system freeze

On Fri, 25 May 2007, Jiri Kosina wrote:

> This is now handled in bugzilla [1]. Zan Lynx also reported this problem, 
> and from the HID_DEBUG output he provided is evident that it is caused by 
> HID layer receiving a report of size 4294967284 (which corresponds to 
> urb->actual_length of the URB received from USB core).

For completness, this is a snippet of HID_DEBUG output that Zan sent me in 
a private mail, which demonstrates the urb->actual_length badness:

...
drivers/hid/hid-core.c: report (size 3) (unnumbered)
drivers/hid/hid-core.c: report 0 (size 3) =  00 00 00
hid-debug: input Keyboard.00e0 = 0
hid-debug: input Keyboard.00e1 = 0
hid-debug: input Keyboard.00e2 = 0
hid-debug: input Keyboard.00e3 = 0
hid-debug: input Keyboard.00e4 = 0
hid-debug: input Keyboard.00e5 = 0
hid-debug: input Keyboard.00e6 = 0
hid-debug: input Keyboard.00e7 = 0
drivers/hid/hid-core.c: report (size 4294967284) (unnumbered)
drivers/hid/hid-core.c: report 0 (size 4294967284) =
hid-debug: input Keyboard.00e0 = 0
hid-debug: input Keyboard.00e1 = 0
hid-debug: input Keyboard.00e2 = 0
hid-debug: input Keyboard.00e3 = 0
hid-debug: input Keyboard.00e4 = 0
hid-debug: input Keyboard.00e5 = 0
hid-debug: input Keyboard.00e6 = 0
hid-debug: input Keyboard.00e7 = 0
drivers/hid/hid-core.c: report (size 6) (numbered)
drivers/hid/hid-core.c: report 2 (size 5) =  00 00 00 00 00
hid-debug: input Button.0001 = 0
hid-debug: input Button.0002 = 0
hid-debug: input Button.0003 = 0
hid-debug: input Button.0004 = 0
hid-debug: input Button.0005 = 0
hid-debug: input Button.0006 = 0
hid-debug: input Button.0007 = 0
hid-debug: input Button.0008 = 0
hid-debug: input GenericDesktop.X = 0
hid-debug: input GenericDesktop.Y = 0
hid-debug: input GenericDesktop.Wheel = 0
Hangcheck: hangcheck value past margin!
drivers/hid/usbhid/hid-core.c: input irq status -75 received

...

-- 
Jiri Kosina
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