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

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

[Dawei Li]

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@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202403040516.CYxoWTXw-lkp@intel.com/
Signed-off-by: Dawei Li <dawei.li@shingroup.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),
 				    GFP_KERNEL);
 	if (!response_msg)
 		return -ENOMEM;
-- 
2.27.0

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

[Conor Dooley]

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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@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202403040516.CYxoWTXw-lkp@intel.com/
> Signed-off-by: Dawei Li <dawei.li@shingroup.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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Re: [PATCH] firmware: microchip: Fix over-requested allocation size

[Dawei Li]

Hi Conor,

Thanks for the quick review.

On Mon, Mar 04, 2024 at 09:52:52AM +0000, Conor Dooley wrote:
> 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@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202403040516.CYxoWTXw-lkp@intel.com/
> > Signed-off-by: Dawei Li <dawei.li@shingroup.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)`?

Because checkpatch complains about 100-character violation and I don't
want to wrap lines :)

I will respin V2 as you suggested.

Thanks,

    Dawei

> 
> Cheers,
> Conor.
> 
> >  				    GFP_KERNEL);
> >  	if (!response_msg)
> >  		return -ENOMEM;
> > -- 
> > 2.27.0
> >