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BUG: KASAN: vmalloc-out-of-bounds in sys_fillrect+0x1da5/0x2570
Write of size 8 at addr ffffc900065ad000 by task syz.0.2278/15552

CPU: 0 UID: 0 PID: 15552 Comm: syz.0.2278 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 sys_fillrect+0x1da5/0x2570
 drm_fbdev_shmem_defio_fillrect+0x2c/0x110
 bit_clear+0x168/0x200
 __fbcon_clear+0x9cd/0xd30
 fbcon_scroll+0x47e/0x7c0
 con_scroll+0x783/0xa10
 csi_ECMA+0x486/0x6850
 do_con_write+0x41ac/0x5500
 con_write+0x27/0x290
 n_tty_write+0xd49/0x11e0
 file_tty_write+0x509/0x9c0
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1bf859e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1bf9457028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1bf8825fa0 RCX: 00007f1bf859e0d9
RDX: 0000000000001006 RSI: 0000200000000e00 RDI: 0000000000000004
RBP: 00007f1bf8635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1bf8826038 R14: 00007f1bf8825fa0 R15: 00007ffeb1fa4648
 </TASK>

The buggy address belongs to a vmalloc virtual mapping
Memory state around the buggy address:
 ffffc900065acf00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900065acf80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc900065ad000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc900065ad080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900065ad100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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