netdev - Re: [PATCH net] ice: Don't dereference NULL in ice_gns

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Message-ID: <e1e3dea5-a393-180a-805a-a944ec778041@gmail.com>
Date: Fri, 26 May 2023 12:48:15 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Simon Horman <horms@...nel.org>,
 Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: Jakub Kicinski <kuba@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>,
 Karol Kolacinski <karol.kolacinski@...el.com>,
 Sudhansu Sekhar Mishra <sudhansu.mishra@...el.com>,
 Dan Carpenter <dan.carpenter@...aro.org>, intel-wired-lan@...ts.osuosl.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] ice: Don't dereference NULL in ice_gns_read error
 path

On 25/05/2023 13:52, Simon Horman wrote:
> If pf is NULL in ice_gns_read() then it will be dereferenced
> in the error path by a call to dev_dbg(ice_pf_to_dev(pf), ...).
> 
> Avoid this by simply returning in this case.
> If logging is desired an alternate approach might be to
> use pr_err() before returning.
> 
> Flagged by Smatch as:
> 
>    .../ice_gnss.c:196 ice_gnss_read() error: we previously assumed 'pf' could be null (see line 131)
> 
> Fixes: 43113ff73453 ("ice: add TTY for GNSS module for E810T device")
> Signed-off-by: Simon Horman <horms@...nel.org>
> ---

LGTM.

Reviewed-by: Tariq Toukan <tariqt@...dia.com>