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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0xc14/0x3750 fs/ext4/xattr.c:1589
Read of size 4 at addr ffff888031c12004 by task syz-executor.4/11873

CPU: 0 PID: 11873 Comm: syz-executor.4 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x93/0xc2 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436
 ext4_xattr_set_entry+0xc14/0x3750 fs/ext4/xattr.c:1589
 ext4_xattr_ibody_set+0x60/0x260 fs/ext4/xattr.c:2227
 ext4_xattr_set_handle+0x71c/0x10e0 fs/ext4/xattr.c:2384
 ext4_xattr_set+0x11d/0x2c0 fs/ext4/xattr.c:2497
 __vfs_setxattr+0xdb/0x130 fs/xattr.c:180
 __vfs_setxattr_noperm+0xee/0x480 fs/xattr.c:214
 vfs_setxattr+0x111/0x2d0 fs/xattr.c:301
 setxattr+0x157/0x260 fs/xattr.c:575
 path_setxattr+0x13c/0x170 fs/xattr.c:595
 __do_sys_setxattr fs/xattr.c:611 [inline]
 __se_sys_setxattr fs/xattr.c:607 [inline]
 __x64_sys_setxattr+0xbb/0x150 fs/xattr.c:607
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53f4be9188 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000100
RBP: 00000000004b069f R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffce6d7951f R14: 00007f53f4be9300 R15: 0000000000022000

The buggy address belongs to the page:
page:00000000b9129f43 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x31c12
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0000cb2088 ffffea0000c97d08 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888031c11f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888031c11f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888031c12000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888031c12080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888031c12100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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