linux-kernel - Re: [PATCH 1/2] VMCI: Remove handle_arr_calc

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Date:   Fri, 8 Dec 2023 22:14:35 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Kees Cook <keescook@...omium.org>
Cc:     Bryan Tan <bryantan@...are.com>, Vishnu Dasa <vdasa@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] VMCI: Remove handle_arr_calc_size()

Le 08/12/2023 à 21:59, Kees Cook a écrit :
> On Fri, Dec 08, 2023 at 09:46:09PM +0100, Christophe JAILLET wrote:
>> Use struct_size() instead of handle_arr_calc_size().
>> This is much more conventionnal.
>>
>> Suggested-by: Kees Cook <keescook@...omium.org>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> 
> Looks good. And since capacity in u32, there's no need for size_add().

Hmm,

isn't u32 + u32 --> u32, so can overflow?
If I understand correctly, the type promotion to size_t will occur after 
the addition.

So size_add() looks needed, or I missed something?

CJ

> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
>