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BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: null-ptr-deref in xattr_getsecurity+0x18a/0x1f0 fs/xattr.c:251
Read of size 20 at addr 0000000000000000 by task syz-executor2/27795

CPU: 1 PID: 27795 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report.cold.7+0x6d/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:345 [inline]
 xattr_getsecurity+0x18a/0x1f0 fs/xattr.c:251
 vfs_getxattr+0xf2/0x160 fs/xattr.c:333
 getxattr+0x139/0x2c0 fs/xattr.c:540
 __do_sys_fgetxattr fs/xattr.c:598 [inline]
 __se_sys_fgetxattr fs/xattr.c:589 [inline]
 __x64_sys_fgetxattr+0x188/0x230 fs/xattr.c:589
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455329
RSP: 002b:00007fc810a5fc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000c1
RAX: ffffffffffffffda RBX: 00007fc810a606d4 RCX: 0000000000455329
RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: fffffffffffffe62 R11: 0000000000000246 R12: 0000000000000014
R13: 0000000000000098 R14: 00000000006f3ee0 R15: 0000000000000003
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