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From:   Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
To:     "Gustavo A. R. Silva" <gustavo@embeddedor.com>
CC:     Igor Mitsyanko <imitsyanko@quantenna.com>,
        Avinash Patil <avinashp@quantenna.com>,
        Sergey Matyukevich <smatyukevich@quantenna.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] qtnfmac: use struct_size() in kzalloc()
Thread-Topic: [PATCH] qtnfmac: use struct_size() in kzalloc()
Thread-Index: AQHUp3dSinG4ayjrKEy6t2WoK7Pj3aWmpvGA
Date:   Wed, 9 Jan 2019 09:08:56 +0000
Message-ID: <20190109090850.2yvksr2y2tejizyl@bars>
References: <20190108172632.GA2918@embeddedor>
In-Reply-To: <20190108172632.GA2918@embeddedor>
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> One of the more common cases of allocation size calculations is finding t=
he
> size of a structure that has a zero-sized array at the end, along with me=
mory
> for some number of elements for that array. For example:
>=20
> struct foo {
>     int stuff;
>     void *entry[];
> };

...

> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
>  drivers/net/wireless/quantenna/qtnfmac/commands.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>=20
> 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;
>=20
> -       hwinfo->rd =3D kzalloc(sizeof(*hwinfo->rd)
> -                            + sizeof(struct ieee80211_reg_rule)
> -                            * resp->n_reg_rules, GFP_KERNEL);
> +       hwinfo->rd =3D kzalloc(struct_size(hwinfo->rd, reg_rules,
> +                                        resp->n_reg_rules), GFP_KERNEL);
>=20
>         if (!hwinfo->rd)
>                 return -ENOMEM;

Thanks!

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

Regards,
Sergey