tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 231bc539066760aaa44d46818c85b14ca2f56d9f commit: 00c9211f60db2dead16856f81a3e6ab86b31f275 crypto: sa2ul - Fix DMA mapping API usage date: 8 months ago config: arm64-randconfig-r005-20210601 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d41cb6bb2607fa5c7a9df2b3dab361353657d225) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 00c9211f60db2dead16856f81a3e6ab86b31f275 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): u16 auth_len; ^ 1 warning generated. vim +/auth_len +1674 drivers/crypto/sa2ul.c 2dc53d0047458e2 Keerthy 2020-07-13 1662 d2c8ac187fc922e Keerthy 2020-07-13 1663 static void sa_aead_dma_in_callback(void *data) d2c8ac187fc922e Keerthy 2020-07-13 1664 { d2c8ac187fc922e Keerthy 2020-07-13 1665 struct sa_rx_data *rxd = (struct sa_rx_data *)data; d2c8ac187fc922e Keerthy 2020-07-13 1666 struct aead_request *req; d2c8ac187fc922e Keerthy 2020-07-13 1667 struct crypto_aead *tfm; d2c8ac187fc922e Keerthy 2020-07-13 1668 unsigned int start; d2c8ac187fc922e Keerthy 2020-07-13 1669 unsigned int authsize; d2c8ac187fc922e Keerthy 2020-07-13 1670 u8 auth_tag[SA_MAX_AUTH_TAG_SZ]; d2c8ac187fc922e Keerthy 2020-07-13 1671 size_t pl, ml; 00c9211f60db2de Peter Ujfalusi 2020-09-23 1672 int i; d2c8ac187fc922e Keerthy 2020-07-13 1673 int err = 0; d2c8ac187fc922e Keerthy 2020-07-13 @1674 u16 auth_len; d2c8ac187fc922e Keerthy 2020-07-13 1675 u32 *mdptr; d2c8ac187fc922e Keerthy 2020-07-13 1676 00c9211f60db2de Peter Ujfalusi 2020-09-23 1677 sa_sync_from_device(rxd); d2c8ac187fc922e Keerthy 2020-07-13 1678 req = container_of(rxd->req, struct aead_request, base); d2c8ac187fc922e Keerthy 2020-07-13 1679 tfm = crypto_aead_reqtfm(req); d2c8ac187fc922e Keerthy 2020-07-13 1680 start = req->assoclen + req->cryptlen; d2c8ac187fc922e Keerthy 2020-07-13 1681 authsize = crypto_aead_authsize(tfm); d2c8ac187fc922e Keerthy 2020-07-13 1682 d2c8ac187fc922e Keerthy 2020-07-13 1683 mdptr = (u32 *)dmaengine_desc_get_metadata_ptr(rxd->tx_in, &pl, &ml); d2c8ac187fc922e Keerthy 2020-07-13 1684 for (i = 0; i < (authsize / 4); i++) d2c8ac187fc922e Keerthy 2020-07-13 1685 mdptr[i + 4] = swab32(mdptr[i + 4]); d2c8ac187fc922e Keerthy 2020-07-13 1686 d2c8ac187fc922e Keerthy 2020-07-13 1687 auth_len = req->assoclen + req->cryptlen; d2c8ac187fc922e Keerthy 2020-07-13 1688 d2c8ac187fc922e Keerthy 2020-07-13 1689 if (rxd->enc) { d2c8ac187fc922e Keerthy 2020-07-13 1690 scatterwalk_map_and_copy(&mdptr[4], req->dst, start, authsize, d2c8ac187fc922e Keerthy 2020-07-13 1691 1); d2c8ac187fc922e Keerthy 2020-07-13 1692 } else { 00c9211f60db2de Peter Ujfalusi 2020-09-23 1693 auth_len -= authsize; d2c8ac187fc922e Keerthy 2020-07-13 1694 start -= authsize; d2c8ac187fc922e Keerthy 2020-07-13 1695 scatterwalk_map_and_copy(auth_tag, req->src, start, authsize, d2c8ac187fc922e Keerthy 2020-07-13 1696 0); d2c8ac187fc922e Keerthy 2020-07-13 1697 d2c8ac187fc922e Keerthy 2020-07-13 1698 err = memcmp(&mdptr[4], auth_tag, authsize) ? -EBADMSG : 0; d2c8ac187fc922e Keerthy 2020-07-13 1699 } d2c8ac187fc922e Keerthy 2020-07-13 1700 00c9211f60db2de Peter Ujfalusi 2020-09-23 1701 sa_free_sa_rx_data(rxd); d2c8ac187fc922e Keerthy 2020-07-13 1702 d2c8ac187fc922e Keerthy 2020-07-13 1703 aead_request_complete(req, err); d2c8ac187fc922e Keerthy 2020-07-13 1704 } d2c8ac187fc922e Keerthy 2020-07-13 1705 :::::: The code at line 1674 was first introduced by commit :::::: d2c8ac187fc922e73930a1b2f6a211e27f595d01 crypto: sa2ul - Add AEAD algorithm support :::::: TO: Keerthy <j-keerthy(a)ti.com&gt; :::::: CC: Herbert Xu <herbert(a)gondor.apana.org.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org