linux-kernel - Re: [PATCH] char: tpm: fix potential null pointer dereference

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Message-ID: <20170530174027.Horde.AYiQnLwlE09KhkcqzdNaVTk@gator4166.hostgator.com>
Date:   Tue, 30 May 2017 17:40:27 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] char: tpm: fix potential null pointer dereference

Hi Jason,

Quoting Jason Gunthorpe <jgunthorpe@...idianresearch.com>:

> On Tue, May 30, 2017 at 05:05:20PM -0500, Gustavo A. R. Silva wrote:
>> NULL check at line 376: if (!chip) {, implies chip might be NULL.
>> Function dev_get_drvdata() dereference pointer chip.
>> Move pointer tmp_dev assignment after the NULL check.
>
> chip cannot be null in st33zp24_send, please remove the bogus if
> instead.
>

I get it.

Thanks for clarifying.
--
Gustavo A. R. Silva