linux-hardening - Re: [PATCH][next] hwspinlock: stm32: Use struct_size() helper in devm

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Date:   Wed, 26 Jan 2022 11:30:55 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-remoteproc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] hwspinlock: stm32: Use struct_size() helper in devm_kzalloc()

On Tue, Jan 25, 2022 at 10:07 AM Gustavo A. R. Silva
<gustavoars@...nel.org> wrote:
>
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
>
> Also, address the following sparse warnings:
> drivers/hwspinlock/stm32_hwspinlock.c:84:32: warning: using sizeof on a flexible structure
>
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

LGTM.
Reviewed-by: Baolin Wang <baolin.wang7@...il.com>

> ---
>  drivers/hwspinlock/stm32_hwspinlock.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c
> index 5bd11a7fab65..716ad4401249 100644
> --- a/drivers/hwspinlock/stm32_hwspinlock.c
> +++ b/drivers/hwspinlock/stm32_hwspinlock.c
> @@ -73,15 +73,14 @@ static int stm32_hwspinlock_probe(struct platform_device *pdev)
>         struct device *dev = &pdev->dev;
>         struct stm32_hwspinlock *hw;
>         void __iomem *io_base;
> -       size_t array_size;
>         int i, ret;
>
>         io_base = devm_platform_ioremap_resource(pdev, 0);
>         if (IS_ERR(io_base))
>                 return PTR_ERR(io_base);
>
> -       array_size = STM32_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
> -       hw = devm_kzalloc(dev, sizeof(*hw) + array_size, GFP_KERNEL);
> +       hw = devm_kzalloc(dev, struct_size(hw, bank.lock, STM32_MUTEX_NUM_LOCKS),
> +                         GFP_KERNEL);
>         if (!hw)
>                 return -ENOMEM;
>
> --
> 2.27.0
>


-- 
Baolin Wang