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BUG: KASAN: slab-out-of-bounds in vcs_scr_readw+0xc2/0xd0 drivers/tty/vt/vt.c:4665
Read of size 2 at addr ffff88821939d2c0 by task syz-executor.5/13275

CPU: 0 PID: 13275 Comm: syz-executor.5 Not tainted 5.4.0-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:133
 vcs_scr_readw+0xc2/0xd0 drivers/tty/vt/vt.c:4665
 vcs_write+0x646/0xcf0 drivers/tty/vt/vc_screen.c:545
 do_loop_readv_writev fs/read_write.c:717 [inline]
 do_loop_readv_writev fs/read_write.c:701 [inline]
 do_iter_write fs/read_write.c:972 [inline]
 do_iter_write+0x4a0/0x610 fs/read_write.c:951
 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1015
 do_writev+0x15b/0x330 fs/read_write.c:1058
 __do_sys_writev fs/read_write.c:1131 [inline]
 __se_sys_writev fs/read_write.c:1128 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1128
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa5d6854c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000000000009 RSI: 0000000020002400 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa5d68556d4
R13: 00000000004c89aa R14: 00000000004e5b18 R15: 00000000ffffffff

Allocated by task 1:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:485
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:526
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 vc_do_resize+0x262/0x1460 drivers/tty/vt/vt.c:1187
 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304
 fbcon_init+0x122d/0x1a90 drivers/video/fbdev/core/fbcon.c:1212
 visual_init+0x30a/0x5e0 drivers/tty/vt/vt.c:1051
 do_bind_con_driver+0x54c/0x8b0 drivers/tty/vt/vt.c:3532
 do_take_over_console+0x449/0x5a0 drivers/tty/vt/vt.c:4113
 do_fbcon_takeover+0x116/0x220 drivers/video/fbdev/core/fbcon.c:581
 fbcon_fb_registered+0x275/0x340 drivers/video/fbdev/core/fbcon.c:3252
 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1652 [inline]
 register_framebuffer+0x5c3/0xa10 drivers/video/fbdev/core/fbmem.c:1821
 vga16fb_probe+0x711/0x825 drivers/video/fbdev/vga16fb.c:1373
 platform_drv_probe+0x8d/0x140 drivers/base/platform.c:725
 really_probe+0x291/0x710 drivers/base/dd.c:548
 driver_probe_device+0x110/0x220 drivers/base/dd.c:721
 __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:828
 bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:430
 __device_attach+0x237/0x390 drivers/base/dd.c:894
 device_initial_probe+0x1b/0x20 drivers/base/dd.c:941
 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:490
 device_add+0x14fe/0x1d00 drivers/base/core.c:2487
 platform_device_add+0x34d/0x6c0 drivers/base/platform.c:562
 vga16fb_init+0x15f/0x1d6 drivers/video/fbdev/vga16fb.c:1431
 do_one_initcall+0x120/0x81a init/main.c:938
 do_initcall_level init/main.c:1006 [inline]
 do_initcalls init/main.c:1014 [inline]
 do_basic_setup init/main.c:1031 [inline]
 kernel_init_freeable+0x4ca/0x5b9 init/main.c:1191
 kernel_init+0x12/0x1bf init/main.c:1109
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88821939c000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4800 bytes inside of
 8192-byte region [ffff88821939c000, ffff88821939e000)
The buggy address belongs to the page:
page:ffffea000864e700 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 index:0x0 compound_mapcount: 0
raw: 057ffe0000010200 ffffea000864d408 ffffea0008622508 ffff8880aa4021c0
raw: 0000000000000000 ffff88821939c000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88821939d180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88821939d200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88821939d280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff88821939d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88821939d380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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