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BUG: KASAN: use-after-free in ntfs_attr_find+0x8df/0xa10 fs/ntfs/attrib.c:613
Read of size 4 at addr ffff8880561562c0 by task syz-executor.1/23367

CPU: 0 PID: 23367 Comm: syz-executor.1 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load_n_noabort+0x6b/0x80 mm/kasan/report.c:440
 ntfs_attr_find+0x8df/0xa10 fs/ntfs/attrib.c:613
 ntfs_attr_lookup+0xeca/0x1f30 fs/ntfs/attrib.c:1203
 ntfs_read_inode_mount+0x6b4/0x1fb0 fs/ntfs/inode.c:1867
 ntfs_fill_super+0x9a6/0x7170 fs/ntfs/super.c:2871
 mount_bdev+0x2b3/0x360 fs/super.c:1134
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x460bca
RSP: 002b:00007fde5e67ca88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fde5e67cb20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fde5e67cae0
RBP: 00007fde5e67cae0 R08: 00007fde5e67cb20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 000000002007dc00

Allocated by task 22978:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_node+0x146/0x410 mm/slab.c:3642
 alloc_task_struct_node kernel/fork.c:156 [inline]
 dup_task_struct kernel/fork.c:515 [inline]
 copy_process.part.0+0x17db/0x6f00 kernel/fork.c:1611
 copy_process kernel/fork.c:1586 [inline]
 _do_fork+0x184/0xc80 kernel/fork.c:2070
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 6368:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758
 __put_task_struct+0x276/0x470 kernel/fork.c:420
 put_task_struct include/linux/sched/task.h:98 [inline]
 delayed_put_task_struct+0x1fb/0x2e0 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946
 __do_softirq+0x254/0xa1d kernel/softirq.c:288

The buggy address belongs to the object at ffff888056156100
 which belongs to the cache task_struct of size 6144
The buggy address is located 448 bytes inside of
 6144-byte region [ffff888056156100, ffff888056157900)
The buggy address belongs to the page:
page:ffffea0001585580 count:1 mapcount:0 mapping:ffff888056156100 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff888056156100 0000000000000000 0000000100000001
raw: ffffea0002a4fa20 ffffea00014ddea0 ffff88821f8307c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888056156180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888056156200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888056156280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888056156300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888056156380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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