[PATCH 2/6] stm32mp: bsec: add check on null size in misc ops

[Patrice CHOTARD]

On 4/27/23 15:36, Patrick Delaunay wrote:
> Add a protection in misc bsec ops for request with null size.
> 
> For example OP-TEE error occurs when get_eth_nb() return 0 in
> setup_mac_address() for unknown part number because U-Boot read 0 OTPs.
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
> ---
> 
>  arch/arm/mach-stm32mp/bsec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c
> index f5f4b20d4776..0dc1e5c3fdc4 100644
> --- a/arch/arm/mach-stm32mp/bsec.c
> +++ b/arch/arm/mach-stm32mp/bsec.c
> @@ -622,7 +622,7 @@ static int stm32mp_bsec_read(struct udevice *dev, int offset,
>  		shadow = false;
>  	}
>  
> -	if ((offs % 4) || (size % 4))
> +	if ((offs % 4) || (size % 4) || !size)
>  		return -EINVAL;
>  
>  	if (IS_ENABLED(CONFIG_OPTEE) && priv->tee) {
> @@ -678,7 +678,7 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset,
>  		shadow = false;
>  	}
>  
> -	if ((offs % 4) || (size % 4))
> +	if ((offs % 4) || (size % 4) || !size)
>  		return -EINVAL;
>  
>  	if (IS_ENABLED(CONFIG_OPTEE) && priv->tee) {
Reviewed-by: Patrice Chotard <patrice.chotard at foss.st.com>

Thanks
Patrice