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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:645 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:95 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0x1494/0x1dd0 drivers/video/fbdev/core/bitblit.c:184
Read of size 1 at addr ffffffff8ca44530 by task syz.4.3740/14290

CPU: 0 UID: 0 PID: 14290 Comm: syz.4.3740 Not tainted 6.15.0-rc1-syzkaller-00025-gbec7dcbc242c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 __fb_pad_aligned_buffer include/linux/fb.h:645 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:95 [inline]
 bit_putcs+0x1494/0x1dd0 drivers/video/fbdev/core/bitblit.c:184
 fbcon_putcs+0x2e2/0x450 drivers/video/fbdev/core/fbcon.c:1309
 con_putc drivers/tty/vt/vt.c:302 [inline]
 hide_softcursor drivers/tty/vt/vt.c:835 [inline]
 hide_cursor+0x381/0x4c0 drivers/tty/vt/vt.c:847
 do_con_write+0x1f1/0x4c40 drivers/tty/vt/vt.c:3068
 con_write+0x26/0x40 drivers/tty/vt/vt.c:3432
 do_output_char+0x64e/0x970 drivers/tty/n_tty.c:422
 process_output drivers/tty/n_tty.c:486 [inline]
 n_tty_write+0xe3c/0x1270 drivers/tty/n_tty.c:2388
 iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
 file_tty_write+0x545/0x9d0 drivers/tty/tty_io.c:1090
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x711/0xd10 fs/read_write.c:684
 ksys_write+0x19d/0x2d0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f451c38d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f451d1e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f451c5a5fa0 RCX: 00007f451c38d169
RDX: 0000000000001006 RSI: 0000200000002080 RDI: 0000000000000003
RBP: 00007f451c40e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f451c5a5fa0 R15: 00007ffc59093658
 </TASK>

The buggy address belongs to the variable:
 fontdata_8x16+0x1210/0x1480

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xca44
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea0000329108 ffffea0000329108 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8ca44400: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffffff8ca44480: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
>ffffffff8ca44500: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                                     ^
 ffffffff8ca44580: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffffff8ca44600: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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