Re: [PATCH v7] rtw_security: fix cast to restricted __le32

[Greg KH <gregkh@linuxfoundation.org>]

On Sun, Jul 04, 2021 at 06:31:12PM +0800, Jhih-Ming Huang wrote:
> This patch fixes the sparse warning of fix cast to restricted __le32.
> 
> There was a change for replacing private CRC-32 routines with in kernel
> ones.
> However, the author used le32_to_cpu to convert crc32_le(), and we
> should use cpu_to_le32.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Jhih-Ming Huang <fbihjmeric@gmail.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_security.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c
> index a99f439328f1..ff79e1aacd1a 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_security.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_security.c
> @@ -92,7 +92,6 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
>  void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
>  {
>  	/*  exclude ICV */
> -	u8 crc[4];
>  	signed int	length;
>  	u32 keylength;
>  	u8 *pframe, *payload, *iv, wepkey[16];
> @@ -119,10 +118,6 @@ void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
>  		/* decrypt payload include icv */
>  		arc4_setkey(ctx, wepkey, 3 + keylength);
>  		arc4_crypt(ctx, payload, payload,  length);
> -
> -		/* calculate icv and compare the icv */
> -		*((u32 *)crc) = le32_to_cpu(~crc32_le(~0, payload, length - 4));
> -
>  	}
>  }
>  
> @@ -537,7 +532,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
>  	u32 pnh;
>  	u8   rc4key[16];
>  	u8   ttkey[16];
> -	u8 crc[4];
> +	__le32 crc;
>  	signed int			length;
>  
>  	u8 *pframe, *payload, *iv, *prwskey;
> @@ -618,10 +613,9 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
>  			arc4_setkey(ctx, rc4key, 16);
>  			arc4_crypt(ctx, payload, payload, length);
>  
> -			*((u32 *)crc) = le32_to_cpu(~crc32_le(~0, payload, length - 4));
> +			crc = cpu_to_le32(~crc32_le(~0, payload, length - 4));
>  
> -			if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] ||
> -			    crc[1] != payload[length - 3] || crc[0] != payload[length - 4])
> +			if (crc != get_unaligned_le32(payload + length - 4))
>  				res = _FAIL;
>  		} else {
>  			res = _FAIL;
> -- 
> 2.32.0
> 
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
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created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
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