==================================================================
BUG: KASAN: global-out-of-bounds in vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1140 [inline]
BUG: KASAN: global-out-of-bounds in vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c36/0x2210 drivers/video/fbdev/vga16fb.c:1260
Read of size 2 at addr ffffffff8899f6be by task syz-executor.2/5824

CPU: 0 PID: 5824 Comm: syz-executor.2 Not tainted 5.9.0-rc4-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+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1140 [inline]
 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
 vga16fb_imageblit+0x1c36/0x2210 drivers/video/fbdev/vga16fb.c:1260
 soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74
 bit_cursor+0x1166/0x17d0 drivers/video/fbdev/core/bitblit.c:386
 fbcon_cursor+0x537/0x660 drivers/video/fbdev/core/fbcon.c:1411
 set_cursor drivers/tty/vt/vt.c:919 [inline]
 set_cursor+0x1d2/0x240 drivers/tty/vt/vt.c:910
 redraw_screen+0x4b9/0x770 drivers/tty/vt/vt.c:1036
 fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3022
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3069
 do_fb_ioctl+0x62e/0x690 drivers/video/fbdev/core/fbmem.c:1106
 fb_compat_ioctl+0x175/0xc10 drivers/video/fbdev/core/fbmem.c:1311
 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f4a549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55440cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601
RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the variable:
 transl_h+0x3e/0x40

Memory state around the buggy address:
 ffffffff8899f580: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8899f600: 00 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9
>ffffffff8899f680: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 f9 f9 f9 f9
                                        ^
 ffffffff8899f700: 00 01 f9 f9 f9 f9 f9 f9 00 00 00 04 f9 f9 f9 f9
 ffffffff8899f780: 00 00 04 f9 f9 f9 f9 f9 00 00 00 00 00 00 02 f9
==================================================================