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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+0x1c8b/0x2200 drivers/video/fbdev/vga16fb.c:1260
Read of size 2 at addr ffffffff889715de by task syz-executor199/9722

CPU: 1 PID: 9722 Comm: syz-executor199 Not tainted 5.6.0-rc2-next-20200224-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:133
 vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1140 [inline]
 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
 vga16fb_imageblit+0x1c8b/0x2200 drivers/video/fbdev/vga16fb.c:1260
 soft_cursor+0x4fb/0xa30 drivers/video/fbdev/core/softcursor.c:74
 bit_cursor+0x12fc/0x1a60 drivers/video/fbdev/core/bitblit.c:386
 fbcon_cursor+0x487/0x660 drivers/video/fbdev/core/fbcon.c:1408
 set_cursor drivers/tty/vt/vt.c:909 [inline]
 set_cursor+0x1fb/0x250 drivers/tty/vt/vt.c:900
 redraw_screen+0x4e1/0x7d0 drivers/tty/vt/vt.c:1025
 fbcon_modechanged+0x5c3/0x790 drivers/video/fbdev/core/fbcon.c:2997
 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3044
 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1056
 fbcon_switch+0x556/0x17f0 drivers/video/fbdev/core/fbcon.c:2293
 redraw_screen+0x2b6/0x7d0 drivers/tty/vt/vt.c:1009
 fbcon_modechanged+0x5c3/0x790 drivers/video/fbdev/core/fbcon.c:2997
 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3044
 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x390/0x6e0 drivers/video/fbdev/core/fbmem.c:1109
 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1185
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x123/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:770
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440309
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff867b35f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90
R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000

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

Memory state around the buggy address:
 ffffffff88971480: 04 fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
 ffffffff88971500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa
>ffffffff88971580: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00
                                                    ^
 ffffffff88971600: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04
 ffffffff88971680: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00
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