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BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x689/0x6f0 drivers/video/fbdev/core/fbcon.c:2462
Read of size 1 at addr ffff88804c897690 by task syz-executor.4/20141

CPU: 1 PID: 20141 Comm: syz-executor.4 Not tainted 4.19.134-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+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430
 fbcon_get_font+0x689/0x6f0 drivers/video/fbdev/core/fbcon.c:2462
 con_font_get drivers/tty/vt/vt.c:4437 [inline]
 con_font_op+0x1f7/0x10e0 drivers/tty/vt/vt.c:4596
 vt_ioctl+0x116d/0x24d0 drivers/tty/vt/vt_ioctl.c:928
 tty_ioctl+0x5b0/0x15c0 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/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: 0033:0x45c369
Code: 8d 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc13c2cfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000f600 RCX: 000000000045c369
RDX: 0000000020000040 RSI: 0000000000004b60 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffe7896730f R14: 00007fc13c2d09c0 R15: 000000000078bf0c

Allocated by task 18240:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 fbcon_set_font+0x34f/0x8a0 drivers/video/fbdev/core/fbcon.c:2644
 con_font_set drivers/tty/vt/vt.c:4529 [inline]
 con_font_op+0xd02/0x10e0 drivers/tty/vt/vt.c:4594
 vt_ioctl+0x167e/0x24d0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0x5b0/0x15c0 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/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 ffff88804c890a80
 which belongs to the cache kmalloc-32768 of size 32768
The buggy address is located 27664 bytes inside of
 32768-byte region [ffff88804c890a80, ffff88804c898a80)
The buggy address belongs to the page:
page:ffffea0001322400 count:1 mapcount:0 mapping:ffff88812c395380 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0001474c08 ffffea00013e1c08 ffff88812c395380
raw: 0000000000000000 ffff88804c890a80 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804c897580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804c897600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804c897680: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff88804c897700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804c897780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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