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BUG: KASAN: global-out-of-bounds in bit_putcs+0x135b/0x1a50
Read of size 1 at addr ffffffff8be58c90 by task syz.0.2683/2148

CPU: 1 UID: 0 PID: 2148 Comm: syz.0.2683 Not tainted syzkaller #0 PREEMPT(full) 
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+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 bit_putcs+0x135b/0x1a50
 fbcon_putcs+0x3e5/0x5f0
 do_con_write+0x2838/0x5200
 con_write+0x24/0x40
 n_tty_write+0xd2c/0x1200
 file_tty_write+0x554/0xa20
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1dcc78ebe9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1dcd5ea038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1dcc9b5fa0 RCX: 00007f1dcc78ebe9
RDX: 0000000000001006 RSI: 0000200000001040 RDI: 0000000000000006
RBP: 00007f1dcc811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1dcc9b6038 R14: 00007f1dcc9b5fa0 R15: 00007fff16f347a8
 </TASK>

The buggy address belongs to the variable:
 fontdata_8x16+0x1010/0x1480

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbe58
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00002f9608 ffffea00002f9608 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8be58b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8be58c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff8be58c80: 00 00 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                         ^
 ffffffff8be58d00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffffff8be58d80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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