==================================================================
BUG: KASAN: stack-out-of-bounds in sys_imageblit+0x1b4a/0x1ee0
Write of size 4 at addr ffffc900043d7d60 by task syz-executor.0/2790

CPU: 0 PID: 2790 Comm: syz-executor.0 Not tainted 6.0.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x14f/0x1be
 print_report.cold+0x59/0x6e9
 kasan_report+0xb1/0x1e0
 sys_imageblit+0x1b4a/0x1ee0
 drm_fbdev_fb_imageblit+0x15c/0x350
 bit_putcs+0x6e1/0xd20
 fbcon_putcs+0x30e/0x3e0
 do_update_region+0x399/0x630
 invert_screen+0x1d4/0x600
 clear_selection+0x55/0x70
 vc_do_resize+0xe61/0x1170
 fbcon_do_set_font+0x490/0x950
 fbcon_set_font+0x7db/0x960
 con_font_op+0x75b/0xcc0
 vt_ioctl+0x1e9f/0x29e0
 tty_ioctl+0xfab/0x15d0
 __x64_sys_ioctl+0x193/0x200
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x464319
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4c3641198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000464319
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 00000000004fffa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00
R13: 00007ff4c36416bc R14: 00000000ffffffff R15: 0000000000000003
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc900043d0000, ffffc900043d9000) created by:
 kernel_clone+0xe7/0xab0

The buggy address belongs to the physical page:
page:000000002e5c7bbf refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a4a5
flags: 0xfffe0000000000(node=0|zone=1|lastcpupid=0x3fff)
raw: 00fffe0000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffffc900043d7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900043d7c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900043d7d00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
                                                       ^
 ffffc900043d7d80: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900043d7e00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
==================================================================
BUG: unable to handle page fault for address: ffffc900043d8000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD e000067 P4D e000067 PUD e205067 PMD 1bb4b067 PTE 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2790 Comm: syz-executor.0 Tainted: G    B              6.0.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:sys_imageblit+0x14d9/0x1ee0
Code: 00 4c 89 ea 46 8b a4 a4 d8 00 00 00 48 c1 ea 03 42 0f b6 0c 32 4c 89 ea 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 69 06 00 00 <45> 89 65 00 45 0f b6 27 41 c0 fc 06 45 0f be e4 41 21 ec 4a 8d 3c
RSP: 0018:ffffc900043f7260 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffc900043f7338 RCX: ffffffff8402c89a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900043d8000
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000400 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc900043d8000 R14: dffffc0000000000 R15: ffff888018a7857a
FS:  00007ff4c3641700(0000) GS:ffff88806be00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900043d8000 CR3: 0000000029226001 CR4: 0000000000170ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_fbdev_fb_imageblit+0x15c/0x350
 bit_putcs+0x6e1/0xd20
 fbcon_putcs+0x30e/0x3e0
 do_update_region+0x399/0x630
 invert_screen+0x1d4/0x600
 clear_selection+0x55/0x70
 vc_do_resize+0xe61/0x1170
 fbcon_do_set_font+0x490/0x950
 fbcon_set_font+0x7db/0x960
 con_font_op+0x75b/0xcc0
 vt_ioctl+0x1e9f/0x29e0
 tty_ioctl+0xfab/0x15d0
 __x64_sys_ioctl+0x193/0x200
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x464319
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4c3641198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000464319
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 00000000004fffa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00
R13: 00007ff4c36416bc R14: 00000000ffffffff R15: 0000000000000003
 </TASK>
Modules linked in:
CR2: ffffc900043d8000
---[ end trace 0000000000000000 ]---
RIP: 0010:sys_imageblit+0x14d9/0x1ee0
Code: 00 4c 89 ea 46 8b a4 a4 d8 00 00 00 48 c1 ea 03 42 0f b6 0c 32 4c 89 ea 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 69 06 00 00 <45> 89 65 00 45 0f b6 27 41 c0 fc 06 45 0f be e4 41 21 ec 4a 8d 3c
RSP: 0018:ffffc900043f7260 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffc900043f7338 RCX: ffffffff8402c89a
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900043d8000
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000400 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc900043d8000 R14: dffffc0000000000 R15: ffff888018a7857a
FS:  00007ff4c3641700(0000) GS:ffff88806be00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900043d8000 CR3: 0000000029226001 CR4: 0000000000170ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 4c 89 ea          	add    %cl,-0x16(%rcx,%rcx,4)
   4:	46 8b a4 a4 d8 00 00 	mov    0xd8(%rsp,%r12,4),%r12d
   b:	00
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	42 0f b6 0c 32       	movzbl (%rdx,%r14,1),%ecx
  15:	4c 89 ea             	mov    %r13,%rdx
  18:	83 e2 07             	and    $0x7,%edx
  1b:	83 c2 03             	add    $0x3,%edx
  1e:	38 ca                	cmp    %cl,%dl
  20:	7c 08                	jl     0x2a
  22:	84 c9                	test   %cl,%cl
  24:	0f 85 69 06 00 00    	jne    0x693
* 2a:	45 89 65 00          	mov    %r12d,0x0(%r13) <-- trapping instruction
  2e:	45 0f b6 27          	movzbl (%r15),%r12d
  32:	41 c0 fc 06          	sar    $0x6,%r12b
  36:	45 0f be e4          	movsbl %r12b,%r12d
  3a:	41 21 ec             	and    %ebp,%r12d
  3d:	4a                   	rex.WX
  3e:	8d                   	.byte 0x8d
  3f:	3c                   	.byte 0x3c