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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+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff88965da0 by task syz-executor.3/22680

CPU: 0 PID: 22680 Comm: syz-executor.3 Not tainted 5.8.0-rc6-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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x2d0/0x630 drivers/tty/vt/vt.c:673
 update_region+0xb5/0x140 drivers/tty/vt/vt.c:701
 vcs_write+0x403/0xc30 drivers/tty/vt/vc_screen.c:623
 do_loop_readv_writev fs/read_write.c:737 [inline]
 do_loop_readv_writev fs/read_write.c:721 [inline]
 do_iter_write+0x48b/0x5f0 fs/read_write.c:1020
 vfs_writev+0x1aa/0x2e0 fs/read_write.c:1091
 do_writev+0x139/0x300 fs/read_write.c:1134
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f3194027c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000037f80 RCX: 000000000045c1f9
RDX: 0000000000000347 RSI: 00000000200002c0 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fff26bca09f R14: 00007f31940289c0 R15: 000000000078bf0c

The buggy address belongs to the variable:
 oid_index+0x8a0/0xa00

Memory state around the buggy address:
 ffffffff88965c80: 00 00 00 00 fa fa fa fa 05 fa fa fa fa fa fa fa
 ffffffff88965d00: 01 fa fa fa fa fa fa fa 00 00 02 fa fa fa fa fa
>ffffffff88965d80: 00 00 00 05 fa fa fa fa 00 00 00 fa fa fa fa fa
                               ^
 ffffffff88965e00: 00 00 00 00 00 01 fa fa fa fa fa fa 00 00 00 00
 ffffffff88965e80: 01 fa fa fa fa fa fa fa 00 00 00 00 fa fa fa fa
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