tree:   https://github.com/0day-ci/linux/commits/UPDATE-20210619-155350/Jhih-Ming-Huang/rtw_security-fix-cast-to-restricted-__le32/20210616-131056
head:   ed0359e3fa64928e48021387a694f211bc840ff7
commit: ed0359e3fa64928e48021387a694f211bc840ff7 rtw_security: fix cast to restricted __le32
date:   2 days ago
config: x86_64-randconfig-a013-20210621 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project e1adf90826a57b674eee79b071fb46c1f5683cd0)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/ed0359e3fa64928e48021387a694f211bc840ff7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review UPDATE-20210619-155350/Jhih-Ming-Huang/rtw_security-fix-cast-to-restricted-__le32/20210616-131056
        git checkout ed0359e3fa64928e48021387a694f211bc840ff7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/staging/rtl8723bs/core/rtw_security.c:95:9: warning: variable 'crc' set but not used [-Wunused-but-set-variable]
           __le32 crc;
                  ^
   1 warning generated.


vim +/crc +95 drivers/staging/rtl8723bs/core/rtw_security.c

    91	
    92	void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
    93	{
    94		/*  exclude ICV */
  > 95		__le32 crc;
    96		signed int	length;
    97		u32 keylength;
    98		u8 *pframe, *payload, *iv, wepkey[16];
    99		u8  keyindex;
   100		struct	rx_pkt_attrib	 *prxattrib = &(((union recv_frame *)precvframe)->u.hdr.attrib);
   101		struct	security_priv *psecuritypriv = &padapter->securitypriv;
   102		struct arc4_ctx *ctx = &psecuritypriv->recv_arc4_ctx;
   103	
   104		pframe = (unsigned char *)((union recv_frame *)precvframe)->u.hdr.rx_data;
   105	
   106		/* start to decrypt recvframe */
   107		if ((prxattrib->encrypt == _WEP40_) || (prxattrib->encrypt == _WEP104_)) {
   108			iv = pframe+prxattrib->hdrlen;
   109			/* keyindex =(iv[3]&0x3); */
   110			keyindex = prxattrib->key_index;
   111			keylength = psecuritypriv->dot11DefKeylen[keyindex];
   112			memcpy(&wepkey[0], iv, 3);
   113			/* memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[psecuritypriv->dot11PrivacyKeyIndex].skey[0], keylength); */
   114			memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[keyindex].skey[0], keylength);
   115			length = ((union recv_frame *)precvframe)->u.hdr.len-prxattrib->hdrlen-prxattrib->iv_len;
   116	
   117			payload = pframe+prxattrib->iv_len+prxattrib->hdrlen;
   118	
   119			/* decrypt payload include icv */
   120			arc4_setkey(ctx, wepkey, 3 + keylength);
   121			arc4_crypt(ctx, payload, payload,  length);
   122	
   123			/* calculate icv and compare the icv */
   124			crc = cpu_to_le32(~crc32_le(~0, payload, length - 4));
   125	
   126		}
   127	}
   128	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org