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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:644 [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+0xa64/0xdf0 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff8bd65286 by task syz.2.2021/14302

CPU: 1 UID: 0 PID: 14302 Comm: syz.2.2021 Not tainted 6.14.0-rc7-syzkaller-00069-g81e4f8d68c66 #0
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+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xd9/0x110 mm/kasan/report.c:634
 __fb_pad_aligned_buffer include/linux/fb.h:644 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xa64/0xdf0 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x364/0x480 drivers/video/fbdev/core/fbcon.c:1308
 do_update_region+0x1f8/0x3f0 drivers/tty/vt/vt.c:609
 update_region+0xc1/0x160 drivers/tty/vt/vt.c:633
 vcs_write+0x7cd/0xdb0 drivers/tty/vt/vc_screen.c:698
 do_loop_readv_writev fs/read_write.c:843 [inline]
 do_loop_readv_writev fs/read_write.c:828 [inline]
 vfs_writev+0x6da/0xdd0 fs/read_write.c:1052
 do_writev+0x133/0x340 fs/read_write.c:1096
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7d0b8d169
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:00007fe7d19fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fe7d0da5fa0 RCX: 00007fe7d0b8d169
RDX: 0000000000000003 RSI: 0000400000000380 RDI: 0000000000000004
RBP: 00007fe7d0c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe7d0da5fa0 R15: 00007ffe7db21b68
 </TASK>

The buggy address belongs to the variable:
 fontdata_8x16+0x1046/0x1140

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbd65
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00002f5948 ffffea00002f5948 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:
 ffffffff8bd65180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8bd65200: 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9
>ffffffff8bd65280: 06 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9
                   ^
 ffffffff8bd65300: 06 f9 f9 f9 f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9
 ffffffff8bd65380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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