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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:674 [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+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff88b66094 by task syz-executor.5/13913

CPU: 1 PID: 13913 Comm: syz-executor.5 Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x5/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430
 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x336/0x4f0 drivers/video/fbdev/core/fbcon.c:1269
 con_flush drivers/tty/vt/vt.c:2559 [inline]
 do_con_write+0xd0e/0x1d90 drivers/tty/vt/vt.c:2812
 con_put_char+0x96/0xe0 drivers/tty/vt/vt.c:3155
 tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:2892
 do_output_char+0x155/0x850 drivers/tty/n_tty.c:486
 __process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:737
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0xc0c/0x2a90 drivers/tty/n_tty.c:1740
 tiocsti drivers/tty/tty_io.c:2194 [inline]
 tty_ioctl+0xff8/0x15c0 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465b09
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:00007f0121704188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 00000000200005c0 RSI: 0000000000005412 RDI: 0000000000000003
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdf0bb3cbf R14: 00007f0121704300 R15: 0000000000022000

The buggy address belongs to the variable:
 oid_index+0x9d4/0xa60

Memory state around the buggy address:
 ffffffff88b65f80: fa fa fa fa 00 00 00 fa fa fa fa fa 00 00 00 00
 ffffffff88b66000: 00 01 fa fa fa fa fa fa 00 00 00 00 01 fa fa fa
>ffffffff88b66080: fa fa fa fa 00 00 00 05 fa fa fa fa 00 00 00 00
                         ^
 ffffffff88b66100: fa fa fa fa 00 03 fa fa fa fa fa fa 04 fa fa fa
 ffffffff88b66180: fa fa fa fa 00 03 fa fa fa fa fa fa 05 fa fa fa
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