syz-executor.1 (7808) used greatest stack depth: 22688 bytes left
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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x35e0/0x3770 fs/ext4/xattr.c:1604
Read of size 4 at addr ffff888077be1083 by task syz-fuzzer/7798

CPU: 1 PID: 7798 Comm: syz-fuzzer Not tainted 4.19.88-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 ext4_xattr_set_entry+0x35e0/0x3770 fs/ext4/xattr.c:1604
 ext4_xattr_ibody_set+0x89/0x2c0 fs/ext4/xattr.c:2240
 ext4_xattr_set_handle+0x5d2/0x1010 fs/ext4/xattr.c:2396
 ext4_initxattrs+0xc0/0x130 fs/ext4/xattr_security.c:43
 security_inode_init_security security/security.c:502 [inline]
 security_inode_init_security+0x2c8/0x3b0 security/security.c:475
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:57
 __ext4_new_inode+0x3b2f/0x52d0 fs/ext4/ialloc.c:1160
 ext4_mkdir+0x3d5/0xdf0 fs/ext4/namei.c:2648
 vfs_mkdir+0x42e/0x690 fs/namei.c:3816
 do_mkdirat+0x234/0x2a0 fs/namei.c:3839
 __do_sys_mkdirat fs/namei.c:3850 [inline]
 __se_sys_mkdirat fs/namei.c:3848 [inline]
 __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3848
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x47c530
Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 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:000000c4201478e8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
RDX: 00000000000001c0 RSI: 000000c42f10e260 RDI: ffffffffffffff9c
RBP: 000000c420147948 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
R13: 0000000000000014 R14: 0000000000000013 R15: 0000000000000100

The buggy address belongs to the page:
page:ffffea0001def840 count:0 mapcount:-128 mapping:0000000000000000 index:0x1
flags: 0xfffe0000000000()
raw: 00fffe0000000000 ffffea0000fd62c8 ffffea0001de9f48 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888077be0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888077be1000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888077be1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888077be1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888077be1180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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