Re: 2.6.13-rc4 use after free in class_device_attr_show

[Andrew Morton <akpm@osdl.org>]

Keith Owens <kaos@sgi.com> wrote:
>
> On Sat, 30 Jul 2005 02:29:55 -0700,
> Andrew Morton <akpm@osdl.org> wrote:
> >Keith Owens <kaos@sgi.com> wrote:
> >>
> >> 2.6.13-rc4 + kdb, with lots of CONFIG_DEBUG options.  There is an
> >>  intermittent use after free in class_device_attr_show.  Reboot with no
> >>  changes and the problem does not always recur.
> >> ...
> >>  ip is at class_device_attr_show+0x50/0xa0
> >> ...
> >
> >It might help to know which file is being read from here.
> >
> >The below patch will record the name of the most-recently-opened sysfs
> >file.  You can print last_sysfs_file[] in the debugger or add the
> >appropriate printk to the ia64 code?
> 
> No need for a patch.  It is /dev/vcsa2.

You mean /sys/class/vc/vcsa2?

That appears to be using generic code...

Can you please summarise what you curently know about this bug?  What is
being accessed after free in class_device_attr_show()?  class_dev_attr? 
cd?

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