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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:641 [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+0x135b/0x1a50 drivers/video/fbdev/core/bitblit.c:184
Read of size 1 at addr ffffffff8be45980 by task syz.1.957/9946

CPU: 1 UID: 0 PID: 9946 Comm: syz.1.957 Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xd2/0x2b0 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 __fb_pad_aligned_buffer include/linux/fb.h:641 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:95 [inline]
 bit_putcs+0x135b/0x1a50 drivers/video/fbdev/core/bitblit.c:184
 fbcon_putcs+0x3e5/0x5f0 drivers/video/fbdev/core/fbcon.c:1314
 do_update_region+0x388/0x440 drivers/tty/vt/vt.c:627
 update_region+0x1ce/0x490 drivers/tty/vt/vt.c:641
 vcs_write+0xd65/0x1260 drivers/tty/vt/vc_screen.c:698
 vfs_write+0x27e/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f677258e929
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:00007f6773364038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f67727b6160 RCX: 00007f677258e929
RDX: 000000000000002f RSI: 0000200000000080 RDI: 0000000000000003
RBP: 00007f6772610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f67727b6160 R15: 00007ffc97e99348
 </TASK>

The buggy address belongs to the variable:
 fontdata_8x16+0x1360/0x1480

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbe45
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00002f9148 ffffea00002f9148 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:
 ffffffff8be45880: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffffff8be45900: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
>ffffffff8be45980: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                   ^
 ffffffff8be45a00: f9 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
 ffffffff8be45a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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