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BUG: KASAN: use-after-free in init_inode fs/reiserfs/inode.c:1327 [inline]
BUG: KASAN: use-after-free in reiserfs_read_locked_inode+0x216f/0x2220 fs/reiserfs/inode.c:1580
Read of size 4 at addr ffff8880391bf000 by task syz-executor.4/9385

CPU: 0 PID: 9385 Comm: syz-executor.4 Not tainted 4.19.147-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+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 init_inode fs/reiserfs/inode.c:1327 [inline]
 reiserfs_read_locked_inode+0x216f/0x2220 fs/reiserfs/inode.c:1580
 reiserfs_fill_super+0x172e/0x2e60 fs/reiserfs/super.c:2084
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460bca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f50e3bfca88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f50e3bfcb20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f50e3bfcae0
RBP: 00007f50e3bfcae0 R08: 00007f50e3bfcb20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020011100

The buggy address belongs to the page:
page:ffffea0000e46fc0 count:0 mapcount:0 mapping:0000000000000000 index:0x1
flags: 0xfffe0000000000()
raw: 00fffe0000000000 ffffea0000e47008 ffff8880ae22fc88 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880391bef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880391bef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880391bf000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880391bf080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880391bf100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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