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BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:380 [inline]
BUG: KASAN: global-out-of-bounds in soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70
Read of size 31 at addr ffffffff8872ad42 by task kworker/0:10/13100

CPU: 0 PID: 13100 Comm: kworker/0:10 Not tainted 5.5.0-rc3-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 memcpy+0x24/0x50 mm/kasan/common.c:125
 memcpy include/linux/string.h:380 [inline]
 soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x12fc/0x1a60 drivers/video/fbdev/core/bitblit.c:386
 fb_flashcursor+0x37a/0x3e0 drivers/video/fbdev/core/fbcon.c:417
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the variable:
 oid_index+0xa02/0xb80

Memory state around the buggy address:
 ffffffff8872ac00: 07 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
 ffffffff8872ac80: 05 fa fa fa fa fa fa fa 01 fa fa fa fa fa fa fa
>ffffffff8872ad00: 00 00 02 fa fa fa fa fa 00 00 00 05 fa fa fa fa
                                                    ^
 ffffffff8872ad80: 00 00 00 fa fa fa fa fa 00 00 00 00 00 01 fa fa
 ffffffff8872ae00: fa fa fa fa 00 00 00 00 01 fa fa fa fa fa fa fa
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