Null pointer dereference in pti_exit()

Null pointer dereference in pti_exit()

[Stanislaw Gruszka]

Hi

We have this bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=783561

Crash when someone load module and do not have actual pti device.
Then misc_deregister(&pti_char_driver) called from pti_exit() will be
done without misc_register(&pti_char_driver), which is called from
pti_pci_probe().

It is not super critical issue since if somebody who do not have
pti device have no reason to load modules, but I guess would be
good to fix this.

Thanks
Stanislaw

Re: Null pointer dereference in pti_exit()

[J Freyensee]

On 03/26/2012 07:31 AM, Stanislaw Gruszka wrote:
> Hi
>
> We have this bug report:
> https://bugzilla.redhat.com/show_bug.cgi?id=783561
>
> Crash when someone load module and do not have actual pti device.
> Then misc_deregister(&pti_char_driver) called from pti_exit() will be
> done without misc_register(&pti_char_driver), which is called from
> pti_pci_probe().
>
> It is not super critical issue since if somebody who do not have
> pti device have no reason to load modules, but I guess would be
> good to fix this.
>

Thanks for the email.  I just got back from a 3 month sabbatical so I am 
slowly getting back into the real world and how to be a computer engineer.

Yes, I am not sure why someone would want to configure their kernel to 
load a PTI module when there is not one on the platform to begin with. 
So that is a configuration problem of a user.  But I'll look at it and 
see if I think of anything; be a good exercise to re-jog my memory.

Thanks,
Jay

> Thanks
> Stanislaw


-- 
J (James/Jay) Freyensee
Storage Technology Group
Intel Corporation