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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+0x137/0x150 drivers/video/fbdev/core/fbmem.c:116
Read of size 1 at addr ffffffff88754580 by task syz-executor.0/7369

CPU: 0 PID: 7369 Comm: syz-executor.0 Not tainted 5.7.0-rc1-next-20200414-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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x315 mm/kasan/report.c:382
 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
 fb_pad_aligned_buffer+0x137/0x150 drivers/video/fbdev/core/fbmem.c:116
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:99 [inline]
 bit_putcs+0xc21/0xe10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x345/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x398/0x630 drivers/tty/vt/vt.c:677
 redraw_screen+0x64c/0x770 drivers/tty/vt/vt.c:1023
 fbcon_do_set_font+0x815/0x950 drivers/video/fbdev/core/fbcon.c:2614
 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2629
 con_font_copy drivers/tty/vt/vt.c:4621 [inline]
 con_font_op+0x666/0x1160 drivers/tty/vt/vt.c:4636
 vt_ioctl+0x1793/0x26b0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0xedc/0x1440 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c889
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:00007ff6bb2f7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff6bb2f86d4 RCX: 000000000045c889
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000036e R14: 00000000004c5e3f R15: 000000000076bf0c

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

Memory state around the buggy address:
 ffffffff88754480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff88754500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff88754580: fa fa fa fa 06 fa fa fa fa fa fa fa 05 fa fa fa
                   ^
 ffffffff88754600: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 03 fa
 ffffffff88754680: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
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