EXT4-fs error (device sda1): ext4_xattr_set_entry:1602: inode #16571: comm syz-fuzzer: corrupted xattr entries
EXT4-fs error (device sda1): ext4_xattr_set_entry:1602: inode #16571: comm syz-fuzzer: corrupted xattr entries
EXT4-fs error (device sda1): ext4_xattr_set_entry:1602: inode #16571: comm syz-fuzzer: corrupted xattr entries
EXT4-fs error (device sda1): ext4_xattr_set_entry:1602: inode #16572: comm syz-fuzzer: corrupted xattr entries
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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x3768/0x3d20 fs/ext4/xattr.c:1599
Read of size 4 at addr ffff88808ad80083 by task syz-fuzzer/8343

CPU: 0 PID: 8343 Comm: syz-fuzzer Not tainted 4.20.0+ #10
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+0x1db/0x2d0 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
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
 ext4_xattr_set_entry+0x3768/0x3d20 fs/ext4/xattr.c:1599
 ext4_xattr_ibody_set+0x80/0x2b0 fs/ext4/xattr.c:2235
 ext4_xattr_set_handle+0x983/0x17d0 fs/ext4/xattr.c:2391
 ext4_initxattrs+0xc0/0x130 fs/ext4/xattr_security.c:43
 security_inode_init_security+0x32f/0x430 security/security.c:513
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:57
 __ext4_new_inode+0x4a47/0x6cb0 fs/ext4/ialloc.c:1160
 ext4_mkdir+0x45a/0xef0 fs/ext4/namei.c:2626
 vfs_mkdir+0x433/0x690 fs/namei.c:3816
 do_mkdirat+0x271/0x2f0 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+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x47fc44
Code: ff ff cc cc cc cc e8 9b 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:000000c4307ef528 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fc44
RDX: 00000000000001c0 RSI: 000000c4314a2080 RDI: ffffffffffffff9c
RBP: 000000c4307ef588 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001000000
R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00022b6000 count:0 mapcount:-128 mapping:0000000000000000 index:0x1
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 ffffea0002455c08 ffffea00023acc08 0000000000000000
raw: 0000000000000001 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808ad7ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808ad80000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88808ad80080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88808ad80100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808ad80180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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