audit: type=1400 audit(1575800027.430:36): avc:  denied  { map } for  pid=7180 comm="syz-executor254" path="/root/syz-executor254759640" 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 ffff888091337088 by task syz-executor254/7208

CPU: 1 PID: 7208 Comm: syz-executor254 Not tainted 4.14.158-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_do_set_font+0x6d1/0x9a0 drivers/video/fbdev/core/fbcon.c:2561
 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2576
 con_font_copy drivers/tty/vt/vt.c:4218 [inline]
 con_font_op+0x5c6/0x1060 drivers/tty/vt/vt.c:4233
 vt_ioctl+0x179f/0x2170 drivers/tty/vt/vt_ioctl.c:979
 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
RIP: 0033:0x446ad9
RSP: 002b:00007f5fd86aed08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc78 RCX: 0000000000446ad9
RDX: 0000000020000180 RSI: 0000000000004b72 RDI: 0000000000000008
RBP: 00000000006dbc70 R08: 00007f5fd86af700 R09: 0000000000000000
R10: 00007f5fd86af700 R11: 0000000000000246 R12: 00000000006dbc7c
R13: 0000000000000000 R14: 00000000f72a8fce R15: 0000000000000001

Allocated by task 7196:
 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 ffff888091336880
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 8 bytes to the right of
 2048-byte region [ffff888091336880, ffff888091337080)
The buggy address belongs to the page:
page:ffffea000244cd80 count:1 mapcount:0 mapping:ffff888091336000 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff888091336000 0000000000000000 0000000100000003
raw: ffffea0001ef56a0 ffffea0001ed77a0 ffff8880aa800c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888091336f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888091337000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888091337080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888091337100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888091337180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================