tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: cd560d8023bf73c94d755908c8d4a0994dd1ec34 commit: bc4bf94cc2aed9192184782dbb9f884c5d6b9e82 [10767/11658] staging:wlan-ng: use memdup_user instead of kmalloc/copy_from_user config: i386-randconfig-s001-20210218 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout bc4bf94cc2aed9192184782dbb9f884c5d6b9e82 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/staging/wlan-ng/p80211netdev.c:572:33: sparse: expected void const [noderef] __user * drivers/staging/wlan-ng/p80211netdev.c:572:33: sparse: got char *[usertype] data vim +572 drivers/staging/wlan-ng/p80211netdev.c 557 558 /* Test the magic, assume ifr is good if it's there */ 559 if (req->magic != P80211_IOCTL_MAGIC) { 560 result = -EINVAL; 561 goto bail; 562 } 563 564 if (cmd == P80211_IFTEST) { 565 result = 0; 566 goto bail; 567 } else if (cmd != P80211_IFREQ) { 568 result = -EINVAL; 569 goto bail; 570 } 571 573 if (IS_ERR(msgbuf)) { 574 result = PTR_ERR(msgbuf); 575 goto bail; 576 } 577 578 result = p80211req_dorequest(wlandev, msgbuf); 579 580 if (result == 0) { 581 if (copy_to_user 582 ((void __user *)req->data, msgbuf, req->len)) { 583 result = -EFAULT; 584 } 585 } 586 kfree(msgbuf); 587 588 bail: 589 /* If allocate,copyfrom or copyto fails, return errno */ 590 return result; 591 } 592 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org