==================================================================
BUG: KASAN: null-ptr-deref in soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70
Read of size 16 at addr 0000000000000200 by task kworker/u4:5/1843

CPU: 0 PID: 1843 Comm: kworker/u4:5 Not tainted 5.15.113-syzkaller-00204-g1fe619a7d252 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_power_efficient fb_flashcursor
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0x168/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memcpy+0x90/0xe8 mm/kasan/shadow.c:65
 soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x113c/0x1a64 drivers/video/fbdev/core/bitblit.c:377
 fb_flashcursor+0x2d4/0x3e0 drivers/video/fbdev/core/fbcon.c:387
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
 worker_thread+0x910/0x1034 kernel/workqueue.c:2454
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000040
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000040] address between user and kernel address ranges
Internal error: Oops: 96000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 1843 Comm: kworker/u4:5 Tainted: G    B             5.15.113-syzkaller-00204-g1fe619a7d252 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_power_efficient fb_flashcursor
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : soft_cursor+0x2b4/0x6b4 drivers/video/fbdev/core/softcursor.c:61
lr : soft_cursor+0x260/0x6b4
sp : ffff800021b07880
x29: ffff800021b078c0 x28: ffff0000cb12be20 x27: dfff800000000000
x26: 0000000000000010 x25: ffff0000cb12be50 x24: 0000000000000000
x23: ffff800021b07a08 x22: 1ffff00004360f41 x21: 1fffe000196257c4
x20: 000000000000000f x19: 0000000000000200 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000200 x13: ffffffffffffffff x12: 0000000000000000
x11: ff8080000af15fe0 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000040 x7 : 0000001000000008 x6 : 0000005000000000
x5 : ffff0000cb12be50 x4 : ffff800021b07a68 x3 : ffff80000af15f38
x2 : 0000000000000010 x1 : 0000000000000010 x0 : 0000000000000200
Call trace:
 soft_cursor+0x2b4/0x6b4 drivers/video/fbdev/core/softcursor.c:61
 bit_cursor+0x113c/0x1a64 drivers/video/fbdev/core/bitblit.c:377
 fb_flashcursor+0x2d4/0x3e0 drivers/video/fbdev/core/fbcon.c:387
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
 worker_thread+0x910/0x1034 kernel/workqueue.c:2454
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Code: f9400393 8b130300 d343fc08 12000809 (38fb6908) 
---[ end trace 0a2022cdeec4ea20 ]---
----------------
Code disassembly (best guess):
   0:	f9400393 	ldr	x19, [x28]
   4:	8b130300 	add	x0, x24, x19
   8:	d343fc08 	lsr	x8, x0, #3
   c:	12000809 	and	w9, w0, #0x7
* 10:	38fb6908 	ldrsb	w8, [x8, x27] <-- trapping instruction