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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 ffffffff88965e0b by task syz-executor.0/10179

CPU: 0 PID: 10179 Comm: syz-executor.0 Not tainted 5.8.0-rc5-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
 con_flush drivers/tty/vt/vt.c:2574 [inline]
 do_con_write+0xc81/0x7400 drivers/tty/vt/vt.c:2825
 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3159
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x3ce/0xf80 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x4d9/0x870 drivers/tty/tty_io.c:1046
 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: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f6f56a7ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000036e00 RCX: 000000000045c1d9
RDX: 0000000000000001 RSI: 00000000200005c0 RDI: 0000000000000006
RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007ffc9d64ffff R14: 00007f6f56a7b9c0 R15: 000000000078bfac

The buggy address belongs to the variable:
 __func__.0+0xb/0x1c0

Memory state around the buggy address:
 ffffffff88965d00: 00 00 00 00 00 01 fa fa fa fa fa fa 00 00 00 00
 ffffffff88965d80: 01 fa fa fa fa fa fa fa 00 00 00 00 fa fa fa fa
>ffffffff88965e00: 00 03 fa fa fa fa fa fa 00 01 fa fa fa fa fa fa
                      ^
 ffffffff88965e80: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
 ffffffff88965f00: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
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