linux-kernel - Re: [PATCH net] ice: Fix freeing uninitialized pointers

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Date: Thu, 21 Mar 2024 19:14:11 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Dan Carpenter <dan.carpenter@...aro.org>, kernel-janitors@...r.kernel.org,
 netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
 Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 David Laight <David.Laight@...lab.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Jesse Brandeburg <jesse.brandeburg@...el.com>, Jiri Pirko
 <jiri@...nulli.us>, Jonathan Cameron <jic23@...nel.org>,
 Julia Lawall <julia.lawall@...ia.fr>, Kees Cook <keescook@...omium.org>,
 Lukasz Czapnik <lukasz.czapnik@...el.com>, Paolo Abeni <pabeni@...hat.com>,
 Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com>
Subject: Re: [PATCH net] ice: Fix freeing uninitialized pointers

>> How do you think about to reduce the scope for the affected local variable instead
>> with the help of a small script (like the following) for the semantic patch language?
>>
>> @movement@
>> attribute name __free;
>> @@
>> -u8 *tx_frame __free(kfree);
>>  int i;
>>  ... when any
>>  if (ice_fltr_add_mac(test_vsi, ...))
>>  { ... }
>> +
>> +{
>> +u8 *tx_frame __free(kfree) = NULL;
>>  if (ice_lbtest_create_frame(pf, &tx_frame, ...))
>>  { ... }
>>  ... when any
>> +}
>> +
>>  valid_frames = ice_lbtest_receive_frames(...);
>
> I believe you don't understand what the scope of the above can be.

Will the understanding improve for the proposed source code transformation?

Regards,
Markus