kernel/module/main.c:4169:1: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot <lkp@intel.com>]

Hi Aaron,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5e725d112e1a54c2611d5dffd124a79415d0f0de
commit: cfc1d277891eb499b3b5354df33b30f598683e90 module: Move all into module/
date:   11 months ago
config: s390-randconfig-s052-20230219 (https://download.01.org/0day-ci/archive/20230219/202302190638.fKs1ga5r-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cfc1d277891eb499b3b5354df33b30f598683e90
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout cfc1d277891eb499b3b5354df33b30f598683e90
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302190638.fKs1ga5r-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/module/main.c:2761:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct mod_kallsyms [noderef] __rcu *kallsyms @@     got void * @@
   kernel/module/main.c:2761:23: sparse:     expected struct mod_kallsyms [noderef] __rcu *kallsyms
   kernel/module/main.c:2761:23: sparse:     got void *
>> kernel/module/main.c:4169:1: sparse: sparse: Using plain integer as NULL pointer
>> kernel/module/main.c:4169:1: sparse: sparse: Using plain integer as NULL pointer
>> kernel/module/main.c:4169:1: sparse: sparse: Using plain integer as NULL pointer
>> kernel/module/main.c:4169:1: sparse: sparse: Using plain integer as NULL pointer
   kernel/module/main.c:4189:1: sparse: sparse: Using plain integer as NULL pointer
   kernel/module/main.c:4189:1: sparse: sparse: Using plain integer as NULL pointer
   kernel/module/main.c: note: in included file (through include/linux/mm_types.h, include/linux/buildid.h, include/linux/module.h, ...):
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *

vim +4169 kernel/module/main.c

b99b87f70c7785 kernel/module.c Peter Oberparleiter 2009-06-17  4168  
17da2bd90abf42 kernel/module.c Heiko Carstens      2009-01-14 @4169  SYSCALL_DEFINE3(init_module, void __user *, umod,
17da2bd90abf42 kernel/module.c Heiko Carstens      2009-01-14  4170  		unsigned long, len, const char __user *, uargs)
^1da177e4c3f41 kernel/module.c Linus Torvalds      2005-04-16  4171  {
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4172  	int err;
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4173  	struct load_info info = { };
^1da177e4c3f41 kernel/module.c Linus Torvalds      2005-04-16  4174  
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4175  	err = may_init_module();
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4176  	if (err)
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4177  		return err;
^1da177e4c3f41 kernel/module.c Linus Torvalds      2005-04-16  4178  
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4179  	pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4180  	       umod, len, uargs);
^1da177e4c3f41 kernel/module.c Linus Torvalds      2005-04-16  4181  
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4182  	err = copy_module_from_user(umod, len, &info);
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4183  	if (err)
34e1169d996ab1 kernel/module.c Kees Cook           2012-10-16  4184  		return err;
^1da177e4c3f41 kernel/module.c Linus Torvalds      2005-04-16  4185  
2f3238aebedb24 kernel/module.c Rusty Russell       2012-10-22  4186  	return load_module(&info, uargs, 0);
e24e2e64c468c8 kernel/module.c Alexey Dobriyan     2008-03-10  4187  }
94462ad3b14739 kernel/module.c Steven Rostedt      2010-11-29  4188  

:::::: The code at line 4169 was first introduced by commit
:::::: 17da2bd90abf428523de0fb98f7075e00e3ed42e [CVE-2009-0029] System call wrappers part 08

:::::: TO: Heiko Carstens <heiko.carstens@de.ibm.com>
:::::: CC: Heiko Carstens <heiko.carstens@de.ibm.com>

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https://github.com/intel/lkp-tests