Re: [PATCH] x86, microcode: Return error from driver init code when loader is disabled

[Borislav Petkov]

On Tue, Jan 27, 2015 at 09:21:09PM -0500, Boris Ostrovsky wrote:
> Commits 65cef1311d5d ("x86, microcode: Add a disable chicken bit") and
> a18a0f6850d4 ("x86, microcode: Don't initialize microcode code on
> paravirt") allow microcode driver skip initialization when microcode
> loading is not permitted.
> 
> However, they don't prevent the driver from being loaded since the
> init code returns 0. If at some point later the driver gets unloaded
> this will result in an oops while trying to deregister the (never
> registered) device.
> 
> To avoid this, make init code return an error on paravirt or when
> microcode loading is disabled. The driver will then never be loaded.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Reported-by: James Digwall <james@xxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 3.18

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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