linux-kernel - Re: kernel oops after ACPI dock initialization fails

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Date:	Tue, 08 May 2007 17:54:40 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	kristen.c.accardi@...el.com
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: kernel oops after ACPI dock initialization fails

Chuck Ebbert wrote:
> In 2.6.21.1 when dock driver initialization fails it does a kfree()
> of dock_station. (Below, this is due to some error installing a
> notify handler.) Later when a bay is discovered it calls 
> is_dock_device() which attempts to lock the (nonexistent)
> dock_station. Reason is this test in is_dock_device():
> 
>         if (!dock_station)
>                 return 0;
> 
> dock_station is 0x6b6b6b6b after being freed. Either it needs
> to be zeroed or some other flag should be used to decide
> whether a dock station is present...
> 

Untested patch attached.



View attachment "acpi_fix_bay-dock_oops.patch" of type "text/plain" (1521 bytes)