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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:663 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0xab7/0xc30 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff87cf5652 by task kworker/1:2/3611

CPU: 1 PID: 3611 Comm: kworker/1:2 Not tainted 4.14.226-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427
 __fb_pad_aligned_buffer include/linux/fb.h:663 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xab7/0xc30 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x2fe/0x480 drivers/video/fbdev/core/fbcon.c:1247
 do_update_region+0x34b/0x5b0 drivers/tty/vt/vt.c:373
 redraw_screen+0x56e/0x790 drivers/tty/vt/vt.c:705
 fbcon_blank+0x986/0xd50 drivers/video/fbdev/core/fbcon.c:2201
 do_unblank_screen+0x1fd/0x4e0 drivers/tty/vt/vt.c:3937
 unblank_screen drivers/tty/vt/vt.c:3956 [inline]
 poke_blanked_console+0x17e/0x1c0 drivers/tty/vt/vt.c:3991
 console_callback+0x277/0x380 drivers/tty/vt/vt.c:2489
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

The buggy address belongs to the variable:
 str__msr__trace_system_name+0xf2/0xb00

Memory state around the buggy address:
 ffffffff87cf5500: fa fa fa fa 00 03 fa fa fa fa fa fa 04 fa fa fa
 ffffffff87cf5580: fa fa fa fa 00 03 fa fa fa fa fa fa 05 fa fa fa
>ffffffff87cf5600: fa fa fa fa 00 06 fa fa fa fa fa fa 00 00 00 03
                                                 ^
 ffffffff87cf5680: fa fa fa fa 00 02 fa fa fa fa fa fa 00 00 07 fa
 ffffffff87cf5700: fa fa fa fa 00 00 07 fa fa fa fa fa 00 00 01 fa
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