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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:656 [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 ffffffff8896a943 by task syz-executor.2/2606
CPU: 1 PID: 2606 Comm: syz-executor.2 Not tainted 5.8.0-rc6-next-20200721-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+0x5/0x497 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:656 [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:665
 update_region+0xb5/0x140 drivers/tty/vt/vt.c:693
 vcs_write+0x403/0xc30 drivers/tty/vt/vc_screen.c:623
 vfs_write+0x2b0/0x6f0 fs/read_write.c:593
 ksys_write+0x12d/0x250 fs/read_write.c:648
 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:00007f9184a1ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000036900 RCX: 000000000045c1f9
RDX: 00000000000000a0 RSI: 00000000200014c0 RDI: 0000000000000006
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffce3b5c93f R14: 00007f9184a1f9c0 R15: 000000000078bf0c
The buggy address belongs to the variable:
 oid_index+0x343/0xa00
Memory state around the buggy address:
 ffffffff8896a800: 07 f9 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
 ffffffff8896a880: 00 05 f9 f9 f9 f9 f9 f9 03 f9 f9 f9 f9 f9 f9 f9
>ffffffff8896a900: 03 f9 f9 f9 f9 f9 f9 f9 03 f9 f9 f9 f9 f9 f9 f9
                                           ^
 ffffffff8896a980: 00 07 f9 f9 f9 f9 f9 f9 00 07 f9 f9 f9 f9 f9 f9
 ffffffff8896aa00: 00 06 f9 f9 f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9
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