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BUG: KASAN: slab-out-of-bounds in do_update_region+0x567/0x5b0 drivers/tty/vt/vt.c:361
Read of size 2 at addr ffff8880568b50c0 by task syz-executor.1/2908

CPU: 1 PID: 2908 Comm: syz-executor.1 Not tainted 4.14.172-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+0x13e/0x194 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393
 do_update_region+0x567/0x5b0 drivers/tty/vt/vt.c:361
 update_region drivers/tty/vt/vt.c:391 [inline]
 update_region+0xdd/0x130 drivers/tty/vt/vt.c:385
 vcs_write+0x30d/0xa80 drivers/tty/vt/vc_screen.c:549
 __vfs_write+0xe4/0x630 fs/read_write.c:480
 vfs_write+0x192/0x4e0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c6c9
RSP: 002b:00007f5152767c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f51527686d4 RCX: 000000000045c6c9
RDX: 00000000fffffe04 RSI: 0000000020001100 RDI: 0000000000000004
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000ccc R14: 00000000004ced57 R15: 000000000076bf2c

Allocated by task 27069:
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15b/0x7c0 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 vc_do_resize+0x1c1/0xe10 drivers/tty/vt/vt.c:872
 fbcon_do_set_font+0x46c/0x990 drivers/video/fbdev/core/fbcon.c:2555
 fbcon_set_font+0x687/0x7c0 drivers/video/fbdev/core/fbcon.c:2651
 con_font_set drivers/tty/vt/vt.c:4162 [inline]
 con_font_op+0xb73/0xf70 drivers/tty/vt/vt.c:4227
 vt_ioctl+0xaf8/0x1f00 drivers/tty/vt/vt_ioctl.c:918
 tty_ioctl+0x6c5/0x1220 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880568b14c0
 which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 15360 bytes inside of
 16384-byte region [ffff8880568b14c0, ffff8880568b54c0)
The buggy address belongs to the page:
page:ffffea00015a2c00 count:1 mapcount:0 mapping:ffff8880568b14c0 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff8880568b14c0 0000000000000000 0000000100000001
raw: ffffea0000fd9620 ffffea0001992e20 ffff88812fe55200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880568b4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880568b5000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880568b5080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880568b5100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880568b5180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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