do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
==================================================================
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+0x890/0xbc0 drivers/video/fbdev/core/bitblit.c:184
Read of size 1 at addr ffff80008b571fd0 by task syz.0.16/7485

CPU: 0 UID: 0 PID: 7485 Comm: syz.0.16 Not tainted 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x220 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:480
 kasan_report+0xb0/0x110 mm/kasan/report.c:593
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 __fb_pad_aligned_buffer include/linux/fb.h:641 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:95 [inline]
 bit_putcs+0x890/0xbc0 drivers/video/fbdev/core/bitblit.c:184
 fbcon_putcs+0x36c/0x554 drivers/video/fbdev/core/fbcon.c:1314
 do_update_region+0x210/0x3e4 drivers/tty/vt/vt.c:617
 update_region+0x1c0/0x458 drivers/tty/vt/vt.c:641
 vcs_write+0x948/0x10f8 drivers/tty/vt/vc_screen.c:698
 do_loop_readv_writev fs/read_write.c:850 [inline]
 vfs_writev+0x3cc/0x7cc fs/read_write.c:1059
 do_writev+0x128/0x290 fs/read_write.c:1103
 __do_sys_writev fs/read_write.c:1171 [inline]
 __se_sys_writev fs/read_write.c:1168 [inline]
 __arm64_sys_writev+0x80/0x94 fs/read_write.c:1168
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the variable:
 fontdata_8x16+0x1010/0x1480

The buggy address ffff80008b571fd0 belongs to a vmalloc virtual mapping
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x203571
flags: 0x5ffc00000002000(reserved|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002000 fffffdffc70d5c48 fffffdffc70d5c48 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff80008b571e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff80008b571f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80008b571f80: 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9
                                                 ^
 ffff80008b572000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffff80008b572080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
==================================================================