linux-kernel - Re: [PATCH v3 2/2] tpm: in tpm2_del_space check if ops pointer is still valid

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Date:   Fri, 5 Feb 2021 11:30:33 +0100
From:   Lino Sanfilippo <l.sanfilippo@...bus.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>, peterhuewe@....de,
        jarkko@...nel.org
Cc:     jgg@...pe.ca, stefanb@...ux.vnet.ibm.com, stable@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] tpm: in tpm2_del_space check if ops pointer is
 still valid


Hi James,

On 05.02.21 01:34, James Bottomley wrote:
> 
> 
> Actually, this still isn't right.  As I said to the last person who
> reported this, we should be doing a get/put on the ops, not rolling our
> own here:
> 
> https://lore.kernel.org/linux-integrity/e7566e1e48f5be9dca034b4bfb67683b5d3cb88f.camel@HansenPartnership.com/
> 

Thanks for pointing this out, I was not aware of this discussion.

> The reporter went silent before we could get this tested, but could you
> try, please, because your patch is still hand rolling the ops get/put,
> just slightly better than it had been done previously.

I tested your patch and it fixes the issue. Your solution seems indeed much cleaner.

FWIW:

Tested-by: Lino Sanfilippo <l.sanfilippo@...bus.com>

Best Regards,
Lino