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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff88740073 by task syz-executor.0/25106

CPU: 1 PID: 25106 Comm: syz-executor.0 Not tainted 5.5.0-rc6-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353
 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677
 redraw_screen+0x676/0x7d0 drivers/tty/vt/vt.c:1011
 fbcon_do_set_font+0x829/0x960 drivers/video/fbdev/core/fbcon.c:2605
 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2620
 con_font_copy drivers/tty/vt/vt.c:4594 [inline]
 con_font_op+0x6b2/0x1270 drivers/tty/vt/vt.c:4609
 compat_kdfontop_ioctl drivers/tty/vt/vt_ioctl.c:1136 [inline]
 vt_compat_ioctl+0x2c4/0x7a0 drivers/tty/vt/vt_ioctl.c:1203
 tty_compat_ioctl+0x1b0/0x420 drivers/tty/tty_io.c:2849
 __do_compat_sys_ioctl fs/compat_ioctl.c:214 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:142 [inline]
 __ia32_compat_sys_ioctl+0x233/0x610 fs/compat_ioctl.c:142
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f0aa39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 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:00000000f5d060bc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004b72
RDX: 0000000020000400 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:
 fontdata_8x16+0x10f3/0x1120

Memory state around the buggy address:
 ffffffff8873ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8873ff80: fa fa fa fa 06 fa fa fa fa fa fa fa 05 fa fa fa
>ffffffff88740000: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 03 fa
                                                             ^
 ffffffff88740080: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff88740100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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