[linux-next:master 5090/5337] include/linux/string.h:380:9: warning: argument 1 null where non-null expected

[linux-next:master 5090/5337] include/linux/string.h:380:9: warning: argument 1 null where non-null expected

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   7ddd09fc4b745fb1d8942f95389583e08412e0cd
commit: 27fc2e84ab6df89e3c8f333701055af6704634c5 [5090/5337] init/Kconfig: enable -O3 for all arches
config: x86_64-randconfig-f003-20191226 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        git checkout 27fc2e84ab6df89e3c8f333701055af6704634c5
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/bitmap.h:9:0,
                    from include/linux/cpumask.h:12,
                    from arch/x86/include/asm/cpumask.h:5,
                    from arch/x86/include/asm/msr.h:11,
                    from arch/x86/include/asm/processor.h:22,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:53,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/ktime.h:24,
                    from include/linux/timer.h:6,
                    from include/linux/netdevice.h:24,
                    from net/wireless/wext-core.c:11:
   net/wireless/wext-core.c: In function 'wext_handle_ioctl':
>> include/linux/string.h:380:9: warning: argument 1 null where non-null expected [-Wnonnull]
     return __builtin_memcpy(p, q, size);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/string.h:380:9: note: in a call to built-in function '__builtin_memcpy'
   net/wireless/wext-core.c: In function 'compat_wext_handle_ioctl':
>> include/linux/string.h:380:9: warning: argument 1 null where non-null expected [-Wnonnull]
     return __builtin_memcpy(p, q, size);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/string.h:380:9: note: in a call to built-in function '__builtin_memcpy'
--
   In file included from include/linux/bitmap.h:9:0,
                    from include/linux/cpumask.h:12,
                    from arch/x86/include/asm/cpumask.h:5,
                    from arch/x86/include/asm/msr.h:11,
                    from arch/x86/include/asm/processor.h:22,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:53,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/linux/ktime.h:24,
                    from include/linux/timer.h:6,
                    from include/linux/netdevice.h:24,
                    from net//wireless/wext-core.c:11:
   net//wireless/wext-core.c: In function 'wext_handle_ioctl':
>> include/linux/string.h:380:9: warning: argument 1 null where non-null expected [-Wnonnull]
     return __builtin_memcpy(p, q, size);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/string.h:380:9: note: in a call to built-in function '__builtin_memcpy'
   net//wireless/wext-core.c: In function 'compat_wext_handle_ioctl':
>> include/linux/string.h:380:9: warning: argument 1 null where non-null expected [-Wnonnull]
     return __builtin_memcpy(p, q, size);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/string.h:380:9: note: in a call to built-in function '__builtin_memcpy'

vim +380 include/linux/string.h

6974f0c4555e28 Daniel Micay 2017-07-12  367  
6974f0c4555e28 Daniel Micay 2017-07-12  368  __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
6974f0c4555e28 Daniel Micay 2017-07-12  369  {
6974f0c4555e28 Daniel Micay 2017-07-12  370  	size_t p_size = __builtin_object_size(p, 0);
6974f0c4555e28 Daniel Micay 2017-07-12  371  	size_t q_size = __builtin_object_size(q, 0);
6974f0c4555e28 Daniel Micay 2017-07-12  372  	if (__builtin_constant_p(size)) {
6974f0c4555e28 Daniel Micay 2017-07-12  373  		if (p_size < size)
6974f0c4555e28 Daniel Micay 2017-07-12  374  			__write_overflow();
6974f0c4555e28 Daniel Micay 2017-07-12  375  		if (q_size < size)
6974f0c4555e28 Daniel Micay 2017-07-12  376  			__read_overflow2();
6974f0c4555e28 Daniel Micay 2017-07-12  377  	}
6974f0c4555e28 Daniel Micay 2017-07-12  378  	if (p_size < size || q_size < size)
6974f0c4555e28 Daniel Micay 2017-07-12  379  		fortify_panic(__func__);
6974f0c4555e28 Daniel Micay 2017-07-12 @380  	return __builtin_memcpy(p, q, size);
6974f0c4555e28 Daniel Micay 2017-07-12  381  }
6974f0c4555e28 Daniel Micay 2017-07-12  382  

:::::: The code at line 380 was first introduced by commit
:::::: 6974f0c4555e285ab217cee58b6e874f776ff409 include/linux/string.h: add the option of fortified string.h functions

:::::: TO: Daniel Micay <danielmicay@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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