linux-kernel - Re: [PATCH][next] qtnfmac: Use struct

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Date:   Mon, 10 Jun 2019 16:14:00 +0000
From:   Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
CC:     Igor Mitsyanko <imitsyanko@...ntenna.com>,
        Avinash Patil <avinashp@...ntenna.com>,
        Sergey Matyukevich <smatyukevich@...ntenna.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] qtnfmac: Use struct_size() in kzalloc()

> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct ieee80211_regdomain {
>         ...
>         struct ieee80211_reg_rule reg_rules[];
> };
> 
> instance = kzalloc(sizeof(*mac->rd) +
>                           sizeof(struct ieee80211_reg_rule) *
>                           count, GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = kzalloc(struct_size(instance, reg_rules, count), GFP_KERNEL);
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
 
Hi Gustavo,
Thanks for the patch !

Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>

Regards,
Sergey