batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
==================================================================
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 ffffffff86e6a2ce by task syz-executor.0/6818

CPU: 1 PID: 6818 Comm: syz-executor.0 Not tainted 4.14.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 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:1301
 do_update_region+0x34b/0x5b0 drivers/tty/vt/vt.c:373
 redraw_screen+0x56e/0x790 drivers/tty/vt/vt.c:705
 fbcon_do_set_font+0x6c3/0x9a0 drivers/video/fbdev/core/fbcon.c:2564
 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2579
 con_font_copy drivers/tty/vt/vt.c:4238 [inline]
 con_font_op+0x58b/0xf60 drivers/tty/vt/vt.c:4253
 vt_ioctl+0x127b/0x1ea0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c369
RSP: 002b:00007f01d52bec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000f540 RCX: 000000000045c369
RDX: 0000000020000480 RSI: 0000000000004b72 RDI: 0000000000000008
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffe6057569f R14: 00007f01d52bf9c0 R15: 000000000078bf0c

The buggy address belongs to the variable:
 oid_index+0x4ce/0x9a0

Memory state around the buggy address:
 ffffffff86e6a180: fa fa fa fa 00 07 fa fa fa fa fa fa 00 07 fa fa
 ffffffff86e6a200: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 00 04
>ffffffff86e6a280: fa fa fa fa 00 00 fa fa fa fa fa fa 00 00 01 fa
                                              ^
 ffffffff86e6a300: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 fa
 ffffffff86e6a380: fa fa fa fa 00 00 00 00 fa fa fa fa 04 fa fa fa
==================================================================