linux-hardening - Re: [PATCH] net: core: use __counted_by for trailing VLA of struct sock

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Message-ID: <20240730170142.32a6e9aa@kernel.org>
Date: Tue, 30 Jul 2024 17:01:42 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Dmitry Antipov <dmantipov@...dex.ru>
Cc: Paolo Abeni <pabeni@...hat.com>, Kees Cook <kees@...nel.org>,
 netdev@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: core: use __counted_by for trailing VLA of struct
 sock_reuseport

On Tue, 30 Jul 2024 19:04:49 +0300 Dmitry Antipov wrote:
> -	unsigned int size = sizeof(struct sock_reuseport) +
> -		      sizeof(struct sock *) * max_socks;
> -	struct sock_reuseport *reuse = kzalloc(size, GFP_ATOMIC);
> +	struct sock_reuseport *reuse =
> +		kzalloc(struct_size(reuse, socks, max_socks), GFP_ATOMIC);
>  

please move the function call out of the init. It doesn't fit on a
single line so what's the point..

> -	if (!reuse)
> +	if (unlikely(!reuse))

And why add the unlikely here? Seems unrelated..
-- 
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