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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x3149/0x3230 fs/ext4/xattr.c:1602
Read of size 4 at addr ffff888076da776f by task syz-executor.2/13790

CPU: 0 PID: 13790 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 ext4_xattr_set_entry+0x3149/0x3230 fs/ext4/xattr.c:1602
 ext4_xattr_ibody_set+0x7a/0x2a0 fs/ext4/xattr.c:2238
 ext4_xattr_set_handle+0x4f5/0xda0 fs/ext4/xattr.c:2394
 ext4_initxattrs+0xc0/0x130 fs/ext4/xattr_security.c:43
 security_inode_init_security security/security.c:492 [inline]
 security_inode_init_security+0x26d/0x360 security/security.c:465
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:57
 __ext4_new_inode+0x3385/0x4860 fs/ext4/ialloc.c:1166
 ext4_mkdir+0x331/0xc20 fs/ext4/namei.c:2657
 vfs_mkdir+0x3ca/0x610 fs/namei.c:3846
 SYSC_mkdirat fs/namei.c:3869 [inline]
 SyS_mkdirat fs/namei.c:3853 [inline]
 SYSC_mkdir fs/namei.c:3880 [inline]
 SyS_mkdir+0x1b7/0x200 fs/namei.c:3878
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459d37
RSP: 002b:00007fff9bc4dba8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00000000000a0595 RCX: 0000000000459d37
RDX: 00007fff9bc4dbf5 RSI: 00000000000001ff RDI: 00007fff9bc4dbf0
RBP: 000000000000025d R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000009
R13: 00007fff9bc4dbe0 R14: 00000000000a051b R15: 00007fff9bc4dbf0

The buggy address belongs to the page:
page:ffffea0001db69c0 count:0 mapcount:-127 mapping:          (null) index:0x1
flags: 0xfffe0000000000()
raw: 00fffe0000000000 0000000000000000 0000000000000001 00000000ffffff80
raw: ffffea0001e2ea60 ffffea0001a0ea60 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888076da7600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888076da7680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888076da7700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff888076da7780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888076da7800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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