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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 ffff88809215a9d3 by task syz-executor.4/18308

CPU: 1 PID: 18308 Comm: syz-executor.4 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: 0033:0x4607ea
RSP: 002b:00007f8c749c0a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8c749c0b20 RCX: 00000000004607ea
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f8c749c0ae0
RBP: 00007f8c749c0ae0 R08: 00007f8c749c0b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020086e00

Allocated by task 9964:
 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
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:530 [inline]
 kvmalloc_node+0x46/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:531 [inline]
 seq_buf_alloc fs/seq_file.c:29 [inline]
 seq_read+0x882/0x1120 fs/seq_file.c:208
 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217
 __vfs_read+0xe4/0x620 fs/read_write.c:411
 vfs_read+0x139/0x340 fs/read_write.c:447
 SYSC_read fs/read_write.c:574 [inline]
 SyS_read+0xf2/0x210 fs/read_write.c:567
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 9964:
 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]
 kfree+0xc9/0x250 mm/slab.c:3815
 kvfree+0x45/0x50 mm/util.c:416
 seq_release fs/seq_file.c:368 [inline]
 single_release+0x75/0xb0 fs/seq_file.c:605
 close_pdeo.part.0+0xdd/0x2c0 fs/proc/inode.c:165
 close_pdeo fs/proc/inode.c:382 [inline]
 proc_reg_release+0x1fd/0x250 fs/proc/inode.c:376
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88809215a000
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 2515 bytes inside of
 4096-byte region [ffff88809215a000, ffff88809215b000)
The buggy address belongs to the page:
page:ffffea0002485680 count:1 mapcount:0 mapping:ffff88809215a000 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff88809215a000 0000000000000000 0000000100000001
raw: ffffea000248a3a0 ffffea0002a95720 ffff88812fe50dc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809215a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809215a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809215a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88809215aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809215aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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