linux-kernel - [kas:lam 5/13] drivers/input/serio/serport.c:216:21: sparse: sparse: incorrect type in assignment (different address spaces)

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Message-ID: <202209201829.bNE1v4V7-lkp@intel.com>
Date:   Tue, 20 Sep 2022 18:25:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [kas:lam 5/13] drivers/input/serio/serport.c:216:21: sparse: sparse:
 incorrect type in assignment (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git lam
head:   8836fbd6cd3120383a0bc63cd54c7dd55639ed49
commit: 2600a472582e2968633831d430c2a1366ad3e8b1 [5/13] x86/uaccess: Provide untagged_addr() and remove tags before address check
config: x86_64-randconfig-s023-20220919 (https://download.01.org/0day-ci/archive/20220920/202209201829.bNE1v4V7-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=2600a472582e2968633831d430c2a1366ad3e8b1
        git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git
        git fetch --no-tags kas lam
        git checkout 2600a472582e2968633831d430c2a1366ad3e8b1
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/acpi/ drivers/input/serio/ drivers/platform/x86/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

sparse warnings: (new ones prefixed by >>)
>> drivers/input/serio/serport.c:216:21: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned long [noderef] __user *__ptr_clean @@     got unsigned long * @@
   drivers/input/serio/serport.c:216:21: sparse:     expected unsigned long [noderef] __user *__ptr_clean
   drivers/input/serio/serport.c:216:21: sparse:     got unsigned long *
--
>> drivers/input/serio/serio_raw.c:178:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected char [noderef] __user *__ptr_clean @@     got char * @@
   drivers/input/serio/serio_raw.c:178:29: sparse:     expected char [noderef] __user *__ptr_clean
   drivers/input/serio/serio_raw.c:178:29: sparse:     got char *
>> drivers/input/serio/serio_raw.c:219:21: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected char const [noderef] __user *__ptr_clean @@     got char const * @@
   drivers/input/serio/serio_raw.c:219:21: sparse:     expected char const [noderef] __user *__ptr_clean
   drivers/input/serio/serio_raw.c:219:21: sparse:     got char const *

vim +216 drivers/input/serio/serport.c

a80d8b02751060 John Sung      2014-09-09  205  
^1da177e4c3f41 Linus Torvalds 2005-04-16  206  /*
^1da177e4c3f41 Linus Torvalds 2005-04-16  207   * serport_ldisc_ioctl() allows to set the port protocol, and device ID
^1da177e4c3f41 Linus Torvalds 2005-04-16  208   */
^1da177e4c3f41 Linus Torvalds 2005-04-16  209  
d78328bcc4d0e6 Jiri Slaby     2021-11-22  210  static int serport_ldisc_ioctl(struct tty_struct *tty, unsigned int cmd,
d78328bcc4d0e6 Jiri Slaby     2021-11-22  211  			       unsigned long arg)
^1da177e4c3f41 Linus Torvalds 2005-04-16  212  {
a80d8b02751060 John Sung      2014-09-09  213  	if (cmd == SPIOCSTYPE) {
^1da177e4c3f41 Linus Torvalds 2005-04-16  214  		unsigned long type;
^1da177e4c3f41 Linus Torvalds 2005-04-16  215  
^1da177e4c3f41 Linus Torvalds 2005-04-16 @216  		if (get_user(type, (unsigned long __user *) arg))
^1da177e4c3f41 Linus Torvalds 2005-04-16  217  			return -EFAULT;
^1da177e4c3f41 Linus Torvalds 2005-04-16  218  
a80d8b02751060 John Sung      2014-09-09  219  		serport_set_type(tty, type);
a80d8b02751060 John Sung      2014-09-09  220  		return 0;
a80d8b02751060 John Sung      2014-09-09  221  	}
a80d8b02751060 John Sung      2014-09-09  222  
a80d8b02751060 John Sung      2014-09-09  223  	return -EINVAL;
a80d8b02751060 John Sung      2014-09-09  224  }
a80d8b02751060 John Sung      2014-09-09  225  

:::::: The code at line 216 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

-- 
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