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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 fb_pad_aligned_buffer+0x138/0x160 drivers/video/fbdev/core/fbmem.c:116
Read of size 1 at addr ffffffff88947080 by task syz-executor.2/18476

CPU: 0 PID: 18476 Comm: syz-executor.2 Not tainted 5.6.0-rc3-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_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
 fb_pad_aligned_buffer+0x138/0x160 drivers/video/fbdev/core/fbmem.c:116
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:99 [inline]
 bit_putcs+0xd14/0xf10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1360
 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677
 redraw_screen+0x676/0x7d0 drivers/tty/vt/vt.c:1022
 fbcon_do_set_font+0x829/0x960 drivers/video/fbdev/core/fbcon.c:2612
 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2627
 con_font_copy drivers/tty/vt/vt.c:4605 [inline]
 con_font_op+0x6b2/0x1270 drivers/tty/vt/vt.c:4620
 vt_ioctl+0x181a/0x26c0 drivers/tty/vt/vt_ioctl.c:970
 tty_ioctl+0xa37/0x14f0 drivers/tty/tty_io.c:2660
 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:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c479
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fab684d1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab684d26d4 RCX: 000000000045c479
RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000036b R14: 00000000004c59ca R15: 000000000076bf2c

The buggy address belongs to the variable:
 fontdata_8x16+0x1000/0x1120

Memory state around the buggy address:
 ffffffff88946f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff88947000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff88947080: fa fa fa fa 06 fa fa fa fa fa fa fa 05 fa fa fa
                   ^
 ffffffff88947100: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 03 fa
 ffffffff88947180: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
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