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BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:348 [inline]
BUG: KASAN: global-out-of-bounds in soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
Read of size 31 at addr ffffffff87cd6511 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.19.118-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:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_address_description.cold+0x5/0x212 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:348 [inline]
 soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x1230/0x1900 drivers/video/fbdev/core/bitblit.c:386
 fb_flashcursor+0x396/0x440 drivers/video/fbdev/core/fbcon.c:399
 process_one_work+0x91f/0x1640 kernel/workqueue.c:2155
 worker_thread+0x96/0xe20 kernel/workqueue.c:2298
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the variable:
 oid_index+0x151/0xa60

Memory state around the buggy address:
 ffffffff87cd6400: 00 00 00 00 00 00 06 fa fa fa fa fa 00 02 fa fa
 ffffffff87cd6480: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 02 fa
>ffffffff87cd6500: fa fa fa fa 00 03 fa fa fa fa fa fa 00 06 fa fa
                         ^
 ffffffff87cd6580: fa fa fa fa 07 fa fa fa fa fa fa fa 00 01 fa fa
 ffffffff87cd6600: fa fa fa fa 00 05 fa fa fa fa fa fa 03 fa fa fa
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