From: Jakub Kicinski <kuba@kernel.org>
To: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Tony Nguyen <anthony.l.nguyen@intel.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Przemek Kitszel <przemyslaw.kitszel@intel.com>,
intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH net] ice: Fix freeing uninitialized pointers
Date: Wed, 20 Mar 2024 20:29:16 -0700 [thread overview]
Message-ID: <20240320202916.2f2bda73@kernel.org> (raw)
In-Reply-To: <facf5615-d7ac-4167-b23c-6bab7c123138@moroto.mountain>
On Wed, 20 Mar 2024 08:01:49 +0300 Dan Carpenter wrote:
> > This is just trading one kind of bug for another, and the __free()
> > magic is at a cost of readability.
> >
> > I think we should ban the use of __free() in all of networking,
> > until / unless it cleanly handles the NULL init case.
>
> Free handles the NULL init case, it doesn't handle the uninitialized
> case. I had previously argued that checkpatch should complain about
> every __free() pointer if the declaration doesn't have an assignment.
>
> The = NULL assignment is unnecessary if the pointer is assigned to
> something else before the first return, so this might cause "unused
> assignment" warnings? I don't know if there are any tools which
> complain about that in that situation. I think probably we should just
> make that an exception and do the checkpatch thing because it's such a
> simple rule to implement.
What I was trying to say is that the __free() thing is supposed to
prevent bugs, and it's not. Even if it was easy to write the matcher
rule, if __free() needs a rule to double check its use - it's failing
at making it easier to write correct code.
In any case. This is a patch for Intel wired, I'll let Intel folks
decide.
next prev parent reply other threads:[~2024-03-21 3:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-16 9:44 [PATCH net] ice: Fix freeing uninitialized pointers Dan Carpenter
2024-03-18 7:58 ` Jiri Pirko
2024-03-18 8:10 ` Dan Carpenter
2024-03-19 19:43 ` Jakub Kicinski
2024-03-20 5:01 ` Dan Carpenter
2024-03-20 7:32 ` Julia Lawall
2024-03-20 16:33 ` Jonathan Cameron
2024-03-21 3:29 ` Jakub Kicinski [this message]
2024-03-21 9:59 ` Przemek Kitszel
2024-03-21 10:34 ` Dan Carpenter
2024-03-20 12:18 ` Markus Elfring
2024-03-21 17:59 ` Markus Elfring
2024-03-21 18:03 ` Andy Shevchenko
2024-03-21 18:14 ` Markus Elfring
2024-03-21 20:20 ` Julia Lawall
2024-03-21 22:27 ` Jesse Brandeburg
2024-03-22 1:48 ` Jakub Kicinski
2024-03-22 1:56 ` Jakub Kicinski
2024-03-22 7:24 ` Julia Lawall
2024-03-22 15:03 ` Jakub Kicinski
2024-03-22 5:30 ` Dan Carpenter
2024-03-22 8:48 ` Markus Elfring
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