audit: type=1400 audit(1575387220.002:36): avc:  denied  { map } for  pid=7060 comm="syz-executor145" path="/root/syz-executor145705848" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:663 [inline]
BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: slab-out-of-bounds in bit_putcs+0xc09/0xdb0 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffff88808b9f4ff4 by task syz-executor145/7060

CPU: 0 PID: 7060 Comm: syz-executor145 Not tainted 4.14.157-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+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load1_noabort+0x14/0x20 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+0xc09/0xdb0 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x3c2/0x480 drivers/video/fbdev/core/fbcon.c:1298
 do_update_region+0x3b3/0x650 drivers/tty/vt/vt.c:373
 redraw_screen+0x589/0x7c0 drivers/tty/vt/vt.c:704
 fbcon_modechanged+0x59e/0x880 drivers/video/fbdev/core/fbcon.c:2946
 fbcon_event_notify+0x11f/0x17af drivers/video/fbdev/core/fbcon.c:3299
 notifier_call_chain+0x111/0x1b0 kernel/notifier.c:93
 __blocking_notifier_call_chain kernel/notifier.c:317 [inline]
 __blocking_notifier_call_chain kernel/notifier.c:304 [inline]
 blocking_notifier_call_chain kernel/notifier.c:328 [inline]
 blocking_notifier_call_chain+0x80/0xa0 kernel/notifier.c:325
 fb_notifier_call_chain+0x25/0x30 drivers/video/fbdev/core/fb_notify.c:45
 fb_set_var+0xb09/0xcf0 drivers/video/fbdev/core/fbmem.c:1054
 do_fb_ioctl+0x3cc/0x940 drivers/video/fbdev/core/fbmem.c:1127
 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1242
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x444dd9
RSP: 002b:00007ffd79b832c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffd79b832d0 RCX: 0000000000444dd9
RDX: 00000000200002c0 RSI: 0000000000004601 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000401690 R09: 0000000000401690
R10: 0000000000401690 R11: 0000000000000246 R12: 0000000000402ae0
R13: 0000000000402b70 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 7060:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15d/0x7a0 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 fbcon_set_font+0x2f8/0x7b0 drivers/video/fbdev/core/fbcon.c:2618
 con_font_set drivers/tty/vt/vt.c:4162 [inline]
 con_font_op+0xc0f/0x1060 drivers/tty/vt/vt.c:4227
 vt_ioctl+0xb80/0x2170 drivers/tty/vt/vt_ioctl.c:927
 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88808b9f4d80
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 628 bytes inside of
 1024-byte region [ffff88808b9f4d80, ffff88808b9f5180)
The buggy address belongs to the page:
page:ffffea00022e7d00 count:1 mapcount:0 mapping:ffff88808b9f4000 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff88808b9f4000 0000000000000000 0000000100000007
raw: ffffea0002302da0 ffff8880aa801848 ffff8880aa800ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808b9f4e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808b9f4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808b9f4f80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff88808b9f5000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808b9f5080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================