linux-kernel - Re: [PATCH] firmware: microchip: Fix over-requested allocation size

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Date: Mon, 4 Mar 2024 09:52:52 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Dawei Li <dawei.li@...ngroup.cn>
CC: <daire.mcnamara@...rochip.com>, <linux-riscv@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] firmware: microchip: Fix over-requested allocation size

Hey,

On Mon, Mar 04, 2024 at 05:25:32PM +0800, Dawei Li wrote:
> cocci warnings: (new ones prefixed by >>)
> >> drivers/firmware/microchip/mpfs-auto-update.c:387:72-78:
>    ERROR: application of sizeof to pointer
>    drivers/firmware/microchip/mpfs-auto-update.c:170:72-78:
>    ERROR: application of sizeof to pointer
> 
> response_msg is a pointer to u32, so the size of element it points to is
> supposed to be a multiple of sizeof(u32), rather than sizeof(u32 *).
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202403040516.CYxoWTXw-lkp@intel.com/
> Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
> ---
>  drivers/firmware/microchip/mpfs-auto-update.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/microchip/mpfs-auto-update.c b/drivers/firmware/microchip/mpfs-auto-update.c
> index 682e417be5a3..7ea3cdb917bc 100644
> --- a/drivers/firmware/microchip/mpfs-auto-update.c
> +++ b/drivers/firmware/microchip/mpfs-auto-update.c
> @@ -384,7 +384,7 @@ static int mpfs_auto_update_available(struct mpfs_auto_update_priv *priv)
>  	u32 *response_msg;
>  	int ret;
>  
> -	response_msg = devm_kzalloc(priv->dev, AUTO_UPDATE_FEATURE_RESP_SIZE * sizeof(response_msg),
> +	response_msg = devm_kzalloc(priv->dev, AUTO_UPDATE_FEATURE_RESP_SIZE * sizeof(u32),

Why not use `sizeof(*response_msg)`?

Cheers,
Conor.

>  				    GFP_KERNEL);
>  	if (!response_msg)
>  		return -ENOMEM;
> -- 
> 2.27.0
> 

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