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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 fb_pad_aligned_buffer+0x137/0x150 drivers/video/fbdev/core/fbmem.c:122
Read of size 1 at addr ffffffff87ad6eaa by task syz-executor.4/20374

CPU: 1 PID: 20374 Comm: syz-executor.4 Not tainted 4.19.109-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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.cold+0x5/0x212 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
 fb_pad_aligned_buffer+0x137/0x150 drivers/video/fbdev/core/fbmem.c:122
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:99 [inline]
 bit_putcs+0xc21/0xe10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x434/0x4f0 drivers/video/fbdev/core/fbcon.c:1320
 do_update_region+0x398/0x630 drivers/tty/vt/vt.c:677
 redraw_screen+0x5e1/0x870 drivers/tty/vt/vt.c:1024
 fbcon_do_set_font+0x727/0xa30 drivers/video/fbdev/core/fbcon.c:2583
 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2598
 con_font_copy drivers/tty/vt/vt.c:4557 [inline]
 con_font_op+0x63f/0x1130 drivers/tty/vt/vt.c:4572
 vt_ioctl+0x1615/0x2310 drivers/tty/vt/vt_ioctl.c:970
 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/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: 0033:0x45c799
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd33d7e9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd33d7ea6d4 RCX: 000000000045c799
RDX: 0000000020000a00 RSI: 0000000000004b72 RDI: 0000000000000009
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000036b R14: 00000000004c5d07 R15: 000000000076bf0c

The buggy address belongs to the variable:
 oid_index+0x6ea/0xa60

Memory state around the buggy address:
 ffffffff87ad6d80: fa fa fa fa 00 00 00 fa fa fa fa fa 00 01 fa fa
 ffffffff87ad6e00: fa fa fa fa 00 00 00 00 fa fa fa fa 04 fa fa fa
>ffffffff87ad6e80: fa fa fa fa 00 01 fa fa fa fa fa fa 04 fa fa fa
                                  ^
 ffffffff87ad6f00: fa fa fa fa 04 fa fa fa fa fa fa fa 07 fa fa fa
 ffffffff87ad6f80: fa fa fa fa 04 fa fa fa fa fa fa fa 05 fa fa fa
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