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BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:347 [inline]
BUG: KASAN: global-out-of-bounds in soft_cursor+0x43d/0xa50 drivers/video/fbdev/core/softcursor.c:70
Read of size 32 at addr ffffffff8706df60 by task kworker/1:3/7245

CPU: 1 PID: 7245 Comm: kworker/1:3 Not tainted 4.14.162-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient fb_flashcursor
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1dc 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+0xa9/0x2af mm/kasan/report.c:393
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memcpy+0x24/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:347 [inline]
 soft_cursor+0x43d/0xa50 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x11be/0x1830 drivers/video/fbdev/core/bitblit.c:386
 fb_flashcursor+0x36d/0x410 drivers/video/fbdev/core/fbcon.c:393
 process_one_work+0x863/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

The buggy address belongs to the variable:
 str__msr__trace_system_name+0x200/0x9a0

Memory state around the buggy address:
 ffffffff8706de00: fa fa fa fa 00 00 00 00 06 fa fa fa fa fa fa fa
 ffffffff8706de80: 00 00 00 fa fa fa fa fa 00 00 00 fa fa fa fa fa
>ffffffff8706df00: 00 00 00 03 fa fa fa fa 00 00 00 04 fa fa fa fa
                                                       ^
 ffffffff8706df80: 00 00 00 00 03 fa fa fa fa fa fa fa 00 00 07 fa
 ffffffff8706e000: fa fa fa fa 00 00 00 00 00 00 03 fa fa fa fa fa
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