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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x35de/0x3770 fs/ext4/xattr.c:1580
Read of size 4 at addr ffff888077f86083 by task syz-fuzzer/9872

CPU: 1 PID: 9872 Comm: syz-fuzzer Not tainted 5.4.0-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.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
 ext4_xattr_set_entry+0x35de/0x3770 fs/ext4/xattr.c:1580
 ext4_xattr_ibody_set+0x80/0x2d0 fs/ext4/xattr.c:2216
 ext4_xattr_set_handle+0x933/0x1200 fs/ext4/xattr.c:2372
 ext4_initxattrs+0xc0/0x130 fs/ext4/xattr_security.c:43
 security_inode_init_security security/security.c:996 [inline]
 security_inode_init_security+0x2c8/0x3b0 security/security.c:969
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:57
 __ext4_new_inode+0x4288/0x4f30 fs/ext4/ialloc.c:1155
 ext4_mkdir+0x3d5/0xe20 fs/ext4/namei.c:2774
 vfs_mkdir+0x42e/0x670 fs/namei.c:3811
 do_mkdirat+0x234/0x2a0 fs/namei.c:3834
 __do_sys_mkdirat fs/namei.c:3845 [inline]
 __se_sys_mkdirat fs/namei.c:3843 [inline]
 __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3843
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x47fd44
Code: ff ff cc cc cc cc e8 9b 40 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:000000c4204278d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44
RDX: 00000000000001c0 RSI: 000000c42291c1e0 RDI: ffffffffffffff9c
RBP: 000000c420427930 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001000000
R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001dfe180 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1
raw: 00fffe0000000000 ffffea00023da588 ffffea0001fc2e88 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888077f85f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888077f86000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888077f86080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888077f86100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888077f86180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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