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xtensa: use __memset in __xtensa_clear_user 

memset on xtensa is capable of accessing user memory, but KASAN checks
if memset function is actually used for that and reports it as an error:

 ==================================================================
 BUG: KASAN: user-memory-access in padzero+0x4d/0x58
 Write of size 519 at addr 0049ddf9 by task init/1

 Call Trace:
  [<b0189978>] kasan_report+0x160/0x238
  [<b0188818>] check_memory_region+0xf8/0x100
  [<b018891c>] memset+0x20/0x34
  [<b0238b71>] padzero+0x4d/0x58
 ==================================================================

Use __memset in __xtensa_clear_user to avoid that.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2017-12-04 21:20:33 -08:00
parent c633544a61
commit e0baa01438
1 changed files with 1 additions and 1 deletions
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2
arch/xtensa/include/asm/uaccess.h
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@ -261,7 +261,7 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
static inline unsigned long
__xtensa_clear_user(void *addr, unsigned long size)
{
if ( ! memset(addr, 0, size) )
if (!__memset(addr, 0, size))
return size;
return 0;
}