EXT4-fs error (device sda1): ext4_xattr_set_entry:1603: inode #16681: comm syz-fuzzer: corrupted xattr entries
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BUG: KASAN: use-after-free in memmove include/linux/string.h:370 [inline]
BUG: KASAN: use-after-free in ext4_xattr_set_entry+0xc2d/0x3710 fs/ext4/xattr.c:1734
Read of size 4 at addr ffff88807ca28ffe by task syz-fuzzer/8139

CPU: 0 PID: 8139 Comm: syz-fuzzer Not tainted 5.1.0-rc5+ #71
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 memmove+0x24/0x50 mm/kasan/common.c:123
 memmove include/linux/string.h:370 [inline]
 ext4_xattr_set_entry+0xc2d/0x3710 fs/ext4/xattr.c:1734
 ext4_xattr_ibody_set+0x80/0x2b0 fs/ext4/xattr.c:2236
 ext4_xattr_set_handle+0x5d2/0x1010 fs/ext4/xattr.c:2392
 ext4_initxattrs+0xc0/0x130 fs/ext4/xattr_security.c:43
 security_inode_init_security security/security.c:952 [inline]
 security_inode_init_security+0x2d1/0x3c0 security/security.c:925
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:57
 __ext4_new_inode+0x44b7/0x5450 fs/ext4/ialloc.c:1160
 ext4_mkdir+0x3d5/0xdf0 fs/ext4/namei.c:2626
 vfs_mkdir+0x433/0x690 fs/namei.c:3815
 do_mkdirat+0x234/0x2a0 fs/namei.c:3838
 __do_sys_mkdirat fs/namei.c:3849 [inline]
 __se_sys_mkdirat fs/namei.c:3847 [inline]
 __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3847
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x47fcb4
Code: ff ff cc cc cc cc e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 45 31 d2 45 31 c0 45 31 c9 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c420391450 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4
RDX: 00000000000001c0 RSI: 000000c42a84a120 RDI: ffffffffffffff9c
RBP: 000000c4203914b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001000000
R13: 0000000001000000 R14: 00007fe5d1ec5000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001f28a00 count:2 mapcount:0 mapping:ffff88821a25fb18 index:0x442
def_blk_aops 
flags: 0x1fffc000000203a(referenced|dirty|lru|active|private)
raw: 01fffc000000203a ffffea000235fb88 ffffea0001e5b308 ffff88821a25fb18
raw: 0000000000000442 ffff8880930df3f0 00000002ffffffff ffff88805c210800
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88805c210800

Memory state around the buggy address:
 ffff88807ca28f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807ca28f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807ca29000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88807ca29080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807ca29100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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