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BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:373 [inline]
BUG: KASAN: global-out-of-bounds in fbcon_get_font+0x2f4/0x6f0 drivers/video/fbdev/core/fbcon.c:2446
Read of size 28 at addr ffffffff87cd6958 by task syz-executor.1/24466

CPU: 1 PID: 24466 Comm: syz-executor.1 Not tainted 4.19.132-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+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x5/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report+0x8f/0x96 mm/kasan/report.c:412
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:373 [inline]
 fbcon_get_font+0x2f4/0x6f0 drivers/video/fbdev/core/fbcon.c:2446
 con_font_get drivers/tty/vt/vt.c:4437 [inline]
 con_font_op+0x1f7/0x10e0 drivers/tty/vt/vt.c:4596
 vt_ioctl+0x167e/0x24d0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0x5b0/0x15c0 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: 8d 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe1c04d4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e85e0 RCX: 000000000045cba9
RDX: 0000000020000500 RSI: 0000000000004b72 RDI: 000000000000000c
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000393 R14: 00000000004c636f R15: 00007fe1c04d56d4

The buggy address belongs to the variable:
 fontdata_8x16+0xff8/0x1120

Memory state around the buggy address:
 ffffffff87cd6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff87cd6880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff87cd6900: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
                                                       ^
 ffffffff87cd6980: 06 fa fa fa fa fa fa fa 05 fa fa fa fa fa fa fa
 ffffffff87cd6a00: 06 fa fa fa fa fa fa fa 00 00 03 fa fa fa fa fa
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