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BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:38 [inline]
BUG: KASAN: slab-out-of-bounds in fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:613
Read of size 2 at addr ffff888028658f32 by task syz.1.2089/15751

CPU: 0 UID: 0 PID: 15751 Comm: syz.1.2089 Tainted: G     U              6.15.0-rc7-syzkaller-00175-g0f8c0258bf04 #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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+0xe0/0x110 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 scr_memcpyw include/linux/vt_buffer.h:38 [inline]
 fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:613
 fbcon_init+0xd77/0x1900 drivers/video/fbdev/core/fbcon.c:1145
 visual_init+0x31d/0x620 drivers/tty/vt/vt.c:1011
 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3831
 vt_bind drivers/tty/vt/vt.c:3987 [inline]
 store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4059
 dev_attr_store+0x55/0x80 drivers/base/core.c:2440
 sysfs_kf_write+0xef/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x354/0x510 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x5bd/0x1180 fs/read_write.c:684
 ksys_write+0x12a/0x240 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbaf78e969
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:00007fbbb05fc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbbaf9b5fa0 RCX: 00007fbbaf78e969
RDX: 00000000fffffdef RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fbbaf810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbbaf9b5fa0 R15: 00007ffcdb26b208
 </TASK>

Allocated by task 10696:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kvmalloc_node_noprof+0x279/0x600 mm/slub.c:5012
 xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline]
 xt_replace_table+0x1e3/0x950 net/netfilter/x_tables.c:1394
 __do_replace+0x1cf/0x9f0 net/ipv4/netfilter/arp_tables.c:912
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0x806/0xa70 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4077
 do_sock_setsockopt+0x221/0x470 net/socket.c:2296
 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321
 __do_sys_setsockopt net/socket.c:2327 [inline]
 __se_sys_setsockopt net/socket.c:2324 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10696:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2380 [inline]
 slab_free mm/slub.c:4642 [inline]
 kfree+0x2b6/0x4d0 mm/slub.c:4841
 xt_free_table_info+0xec/0x220 net/netfilter/x_tables.c:1209
 __do_replace+0x773/0x9f0 net/ipv4/netfilter/arp_tables.c:933
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0x806/0xa70 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4077
 do_sock_setsockopt+0x221/0x470 net/socket.c:2296
 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321
 __do_sys_setsockopt net/socket.c:2327 [inline]
 __se_sys_setsockopt net/socket.c:2324 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888028658f20
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 2 bytes to the right of
 allocated 16-byte region [ffff888028658f20, ffff888028658f30)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888028658240 pfn:0x28658
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441640 0000000000000000 dead000000000001
raw: ffff888028658240 000000008080007e 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5841, tgid 5841 (syz-executor), ts 147798923560, free_ts 147798812752
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1714
 prep_new_page mm/page_alloc.c:1722 [inline]
 get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3684
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4974
 alloc_slab_page mm/slub.c:2452 [inline]
 allocate_slab mm/slub.c:2618 [inline]
 new_slab+0x94/0x340 mm/slub.c:2672
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 __do_kmalloc_node mm/slub.c:4326 [inline]
 __kvmalloc_node_noprof+0x3a6/0x600 mm/slub.c:5012
 xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline]
 xt_replace_table+0x1e3/0x950 net/netfilter/x_tables.c:1394
 __do_replace+0x1cf/0x9f0 net/ipv4/netfilter/arp_tables.c:912
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0x806/0xa70 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4077
 do_sock_setsockopt+0x221/0x470 net/socket.c:2296
 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321
 __do_sys_setsockopt net/socket.c:2327 [inline]
 __se_sys_setsockopt net/socket.c:2324 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
page last free pid 5841 tgid 5841 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1258 [inline]
 __free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2721
 ___free_pages_bulk mm/kasan/shadow.c:332 [inline]
 __kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline]
 kasan_populate_vmalloc+0x18c/0x1f0 mm/kasan/shadow.c:417
 alloc_vmap_area+0x919/0x2970 mm/vmalloc.c:2035
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3138
 __vmalloc_node_range_noprof+0x277/0x1540 mm/vmalloc.c:3805
 __vmalloc_node_noprof mm/vmalloc.c:3908 [inline]
 vzalloc_noprof+0x6b/0x90 mm/vmalloc.c:3981
 xt_counters_alloc+0x4c/0x70 net/netfilter/x_tables.c:1380
 __do_replace+0x97/0x9f0 net/ipv4/netfilter/arp_tables.c:894
 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
 do_ip6t_set_ctl+0x806/0xa70 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4077
 do_sock_setsockopt+0x221/0x470 net/socket.c:2296
 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321
 __do_sys_setsockopt net/socket.c:2327 [inline]
 __se_sys_setsockopt net/socket.c:2324 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94

Memory state around the buggy address:
 ffff888028658e00: 00 06 fc fc fa fb fc fc fa fb fc fc 00 01 fc fc
 ffff888028658e80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
>ffff888028658f00: fa fb fc fc fa fb fc fc fa fb fc fc 00 00 fc fc
                                     ^
 ffff888028658f80: 00 01 fc fc 00 04 fc fc 00 06 fc fc fa fb fc fc
 ffff888028659000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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