netdev - Re: [Intel-wired-lan] [PATCH v2 0/7 iwl-next] idpf: refactor virtchnl messages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Mon, 29 Jan 2024 14:23:35 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Alan Brady <alan.brady@...el.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<willemdebruijn.kernel@...il.com>, <igor.bagnucki@...el.com>,
	<przemyslaw.kitszel@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH v2 0/7 iwl-next] idpf: refactor virtchnl
 messages

From: Alan Brady <alan.brady@...el.com>
Date: Thu, 25 Jan 2024 21:47:40 -0800

> The motivation for this series has two primary goals. We want to enable
> support of multiple simultaneous messages and make the channel more
> robust. The way it works right now, the driver can only send and receive
> a single message at a time and if something goes really wrong, it can
> lead to data corruption and strange bugs.

[...]

There are a fistful of functions in this series and IDPF's virtchnl code
in general that allocate a memory chunk via kzalloc() family and then
free it at the end of the function, i.e. the lifetime of those buffers
are the lifetime of the function.
Since recently, we have auto-variables in the kernel, so that the pieces
I described could be converted to:

	struct x *ptr __free(kfree) = NULL;

	ptr = kzalloc(sizeof(*x), GPF_KERNEL);

	// some code

	return 0; // kfree() is not needed anymore

err:
	return err; // here as well

That would allow to simplify the code and reduce its size.
I'd like you to convert such functions to use auto-variables.

Thanks,
Olek