==================================================================
BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x58a/0x5b0 drivers/video/fbdev/core/fbcon.c:2459
Read of size 1 at addr ffff88802a3d1fd0 by task syz-executor.3/11820

CPU: 1 PID: 11820 Comm: syz-executor.3 Not tainted 4.19.113-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+0x7c/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
 fbcon_get_font+0x58a/0x5b0 drivers/video/fbdev/core/fbcon.c:2459
 con_font_get drivers/tty/vt/vt.c:4409 [inline]
 con_font_op+0x1f7/0x1130 drivers/tty/vt/vt.c:4568
 vt_ioctl+0xc6c/0x2310 drivers/tty/vt/vt_ioctl.c:918
 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: 0033:0x45c849
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:00007fd94a031c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd94a0326d4 RCX: 000000000045c849
RDX: 0000000020000080 RSI: 0000000000004b60 RDI: 0000000000000009
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000327 R14: 00000000004c58c1 R15: 000000000076bf0c

Allocated by task 23666:
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15b/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2641
 con_font_set drivers/tty/vt/vt.c:4501 [inline]
 con_font_op+0xd3e/0x1130 drivers/tty/vt/vt.c:4566
 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

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88802a3c65c0
 which belongs to the cache kmalloc-65536 of size 65536
The buggy address is located 47632 bytes inside of
 65536-byte region [ffff88802a3c65c0, ffff88802a3d65c0)
The buggy address belongs to the page:
page:ffffea0000a8f000 count:1 mapcount:0 mapping:ffff88812c3d5500 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0000a8c808 ffffea0000b9f008 ffff88812c3d5500
raw: 0000000000000000 ffff88802a3c65c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88802a3d1e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802a3d1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802a3d1f80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff88802a3d2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802a3d2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================