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Date:   Wed, 9 Jan 2019 09:08:56 +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] 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 foo {
>     int stuff;
>     void *entry[];
> };

...

> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/net/wireless/quantenna/qtnfmac/commands.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/quantenna/qtnfmac/commands.c b/drivers/net/wireless/quantenna/qtnfmac/commands.c
> index 659e7649fe22..cf386f579060 100644
> --- a/drivers/net/wireless/quantenna/qtnfmac/commands.c
> +++ b/drivers/net/wireless/quantenna/qtnfmac/commands.c
> @@ -914,9 +914,8 @@ qtnf_cmd_resp_proc_hw_info(struct qtnf_bus *bus,
>         if (WARN_ON(resp->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
>                 return -E2BIG;
> 
> -       hwinfo->rd = kzalloc(sizeof(*hwinfo->rd)
> -                            + sizeof(struct ieee80211_reg_rule)
> -                            * resp->n_reg_rules, GFP_KERNEL);
> +       hwinfo->rd = kzalloc(struct_size(hwinfo->rd, reg_rules,
> +                                        resp->n_reg_rules), GFP_KERNEL);
> 
>         if (!hwinfo->rd)
>                 return -ENOMEM;

Thanks!

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

Regards,
Sergey

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