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

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Message-Id: <20190625050155.537F1607C3@smtp.codeaurora.org>
Date:   Tue, 25 Jun 2019 05:01:55 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Igor Mitsyanko <imitsyanko@...ntenna.com>,
        Avinash Patil <avinashp@...ntenna.com>,
        Sergey Matyukevich <smatyukevich@...ntenna.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] qtnfmac: Use struct_size() in kzalloc()

"Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:

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

Patch applied to wireless-drivers-next.git, thanks.

9a1ace64ca3b qtnfmac: Use struct_size() in kzalloc()

-- 
https://patchwork.kernel.org/patch/10982675/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches