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BUG: KASAN: global-out-of-bounds in fbcon_resize+0x705/0x7b0 drivers/video/fbdev/core/fbcon.c:2145
Read of size 4 at addr ffffffff86e69218 by task syz-executor.0/13066

CPU: 0 PID: 13066 Comm: syz-executor.0 Not tainted 4.14.198-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_load4_noabort+0x68/0x70 mm/kasan/report.c:429
 fbcon_resize+0x705/0x7b0 drivers/video/fbdev/core/fbcon.c:2145
 resize_screen drivers/tty/vt/vt.c:839 [inline]
 vc_do_resize+0x38b/0xe00 drivers/tty/vt/vt.c:901
 vt_resize+0xa3/0xe0 drivers/tty/vt/vt.c:1015
 tiocswinsz drivers/tty/tty_io.c:2267 [inline]
 tty_ioctl+0xf3c/0x13c0 drivers/tty/tty_io.c:2576
 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: 0033:0x45de59
RSP: 002b:00007f4359b72c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000019e80 RCX: 000000000045de59
RDX: 00000000200000c0 RSI: 0000000000005414 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe21a4255f R14: 00007f4359b739c0 R15: 000000000118bf2c

The buggy address belongs to the variable:
 font_vga_8x16+0x58/0x60

Memory state around the buggy address:
 ffffffff86e69100: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
 ffffffff86e69180: 00 fa fa fa fa fa fa fa 00 00 00 00 00 fa fa fa
>ffffffff86e69200: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffffffff86e69280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff86e69300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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