linux-kernel - Re: [PATCH][next] mlxsw: thermal: Fix null dereference of NULL temperature parameter

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Date:   Wed, 9 Jun 2021 21:07:35 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mykola Kostenok <c_mykolak@...dia.com>,
        Vadim Pasternak <vadimp@...dia.com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mlxsw: thermal: Fix null dereference of NULL
 temperature parameter

On Wed, Jun 09, 2021 at 06:56:57PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The call to mlxsw_thermal_module_temp_and_thresholds_get passes a NULL
> pointer for the temperature and this can be dereferenced in this function
> if the mlxsw_reg_query call fails.  The simplist fix is to pass the
> address of dummy temperature variable instead of a NULL pointer.
> 
> Addresses-Coverity: ("Explicit null dereferenced")
> Fixes: 72a64c2fe9d8 ("mlxsw: thermal: Read module temperature thresholds using MTMP register")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Ido Schimmel <idosch@...dia.com>

Thanks