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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x33cb/0x3710 fs/ext4/xattr.c:1600
Read of size 4 at addr ffff888079b1c064 by task syz-executor.1/25940

CPU: 0 PID: 25940 Comm: syz-executor.1 Not tainted 5.1.0-rc6+ #89
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
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 ext4_xattr_set_entry+0x33cb/0x3710 fs/ext4/xattr.c:1600
 ext4_xattr_ibody_set+0x80/0x2b0 fs/ext4/xattr.c:2236
 ext4_xattr_set_handle+0x5d2/0x1010 fs/ext4/xattr.c:2392
 ext4_xattr_set+0x1e5/0x370 fs/ext4/xattr.c:2504
 ext4_xattr_security_set+0x36/0x40 fs/ext4/xattr_security.c:30
 __vfs_setxattr+0x121/0x190 fs/xattr.c:149
 __vfs_setxattr_noperm+0x11c/0x410 fs/xattr.c:180
 vfs_setxattr+0xda/0x100 fs/xattr.c:223
 setxattr+0x26f/0x380 fs/xattr.c:450
 path_setxattr+0x197/0x1b0 fs/xattr.c:469
 __do_sys_setxattr fs/xattr.c:484 [inline]
 __se_sys_setxattr fs/xattr.c:480 [inline]
 __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd6a41aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000000
RBP: 000000000073bf00 R08: 0400000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd6a41ab6d4
R13: 00000000004bf591 R14: 00000000004dcd10 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0001e6c700 count:0 mapcount:-128 mapping:0000000000000000 index:0x1
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 ffffea0001f0c388 ffffea000203b108 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888079b1bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888079b1bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888079b1c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff888079b1c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888079b1c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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