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BUG: KASAN: use-after-free in scr_memcpyw include/linux/vt_buffer.h:38 [inline]
BUG: KASAN: use-after-free in fbcon_prepare_logo+0x94e/0xc60 drivers/video/fbdev/core/fbcon.c:686
Read of size 26 at addr ffff88806b16a7e8 by task syz.3.2604/17340

CPU: 0 UID: 0 PID: 17340 Comm: syz.3.2604 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 scr_memcpyw include/linux/vt_buffer.h:38 [inline]
 fbcon_prepare_logo+0x94e/0xc60 drivers/video/fbdev/core/fbcon.c:686
 fbcon_init+0x1065/0x1830 drivers/video/fbdev/core/fbcon.c:1228
 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1048
 do_bind_con_driver.isra.0+0x636/0x9c0 drivers/tty/vt/vt.c:4056
 vt_bind drivers/tty/vt/vt.c:4212 [inline]
 store_bind+0x609/0x730 drivers/tty/vt/vt.c:4284
 dev_attr_store+0x58/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd85a99cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd858bcd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd85ac16090 RCX: 00007fd85a99cdd9
RDX: 000000000008083a RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007fd85aa32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd85ac16128 R14: 00007fd85ac16090 R15: 00007ffe16a7c238
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88806b16a280 pfn:0x6b16a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea0000abe408 ffffea0001a33b88 0000000000000000
raw: ffff88806b16a280 0000000000000001 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x10cc0(GFP_KERNEL|__GFP_NORETRY), pid 15387, tgid 15386 (syz.3.2141), ts 811491348568, free_ts 812818959948
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 alloc_pages_noprof+0x1a/0x160 mm/mempolicy.c:2581
 kimage_alloc_pages+0x72/0x380 kernel/kexec_core.c:284
 kimage_alloc_normal_control_pages kernel/kexec_core.c:358 [inline]
 kimage_alloc_control_pages+0x157/0xa20 kernel/kexec_core.c:471
 kimage_alloc_init kernel/kexec.c:67 [inline]
 do_kexec_load+0x275/0x810 kernel/kexec.c:130
 __do_sys_kexec_load kernel/kexec.c:261 [inline]
 __se_sys_kexec_load kernel/kexec.c:242 [inline]
 __x64_sys_kexec_load+0x1bf/0x230 kernel/kexec.c:242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 15387 tgid 15386 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2943
 kimage_free_page_list+0x130/0x240 kernel/kexec_core.c:325
 kimage_alloc_normal_control_pages kernel/kexec_core.c:390 [inline]
 kimage_alloc_control_pages+0x3f2/0xa20 kernel/kexec_core.c:471
 kimage_alloc_init kernel/kexec.c:67 [inline]
 do_kexec_load+0x275/0x810 kernel/kexec.c:130
 __do_sys_kexec_load kernel/kexec.c:261 [inline]
 __se_sys_kexec_load kernel/kexec.c:242 [inline]
 __x64_sys_kexec_load+0x1bf/0x230 kernel/kexec.c:242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88806b16a680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806b16a700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806b16a780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88806b16a800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806b16a880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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