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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+0x94e/0xc60 drivers/video/fbdev/core/fbcon.c:646
Read of size 26 at addr ffff888035fea2ea by task syz.2.2763/19679

CPU: 0 UID: 0 PID: 19679 Comm: syz.2.2763 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0x156/0x4c9 mm/kasan/report.c:482
 kasan_report+0xdf/0x1e0 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:646
 fbcon_init+0x10a0/0x1820 drivers/video/fbdev/core/fbcon.c:1180
 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1014
 do_bind_con_driver.isra.0+0x636/0x9c0 drivers/tty/vt/vt.c:3954
 vt_bind drivers/tty/vt/vt.c:4110 [inline]
 store_bind+0x609/0x730 drivers/tty/vt/vt.c:4182
 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
 iter_file_splice_write+0x830/0x10a0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x192/0x6c0 fs/splice.c:1159
 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x174/0x240 fs/splice.c:1228
 do_sendfile+0xadc/0xe20 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64 fs/read_write.c:1419 [inline]
 __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1419
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f050db9c799
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:00007f050e9f3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f050de16180 RCX: 00007f050db9c799
RDX: 0000000000000000 RSI: 000000000000000d RDI: 0000000000000007
RBP: 00007f050dc32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f050de16218 R14: 00007f050de16180 R15: 00007ffd20fbd018
 </TASK>

Allocated by task 5954:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5238 [inline]
 __kmalloc_node_noprof+0x307/0x850 mm/slub.c:5244
 kmalloc_node_noprof include/linux/slab.h:1081 [inline]
 alloc_slab_obj_exts+0x4e/0x190 mm/slub.c:2174
 __memcg_slab_post_alloc_hook+0x24a/0x9a0 mm/memcontrol.c:3234
 memcg_slab_post_alloc_hook mm/slub.c:2464 [inline]
 slab_post_alloc_hook mm/slub.c:4526 [inline]
 slab_alloc_node mm/slub.c:4844 [inline]
 kmem_cache_alloc_lru_noprof+0x592/0x6e0 mm/slub.c:4863
 __d_alloc+0x34/0xa80 fs/dcache.c:1740
 d_alloc_pseudo+0x1c/0xc0 fs/dcache.c:1871
 alloc_path_pseudo fs/file_table.c:364 [inline]
 alloc_file_pseudo+0xcf/0x230 fs/file_table.c:380
 sock_alloc_file+0x50/0x210 net/socket.c:483
 sock_map_fd net/socket.c:513 [inline]
 __sys_socket+0x1c0/0x260 net/socket.c:1756
 __do_sys_socket net/socket.c:1761 [inline]
 __se_sys_socket net/socket.c:1759 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888035fea200
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 66 bytes to the right of
 allocated 168-byte region [ffff888035fea200, ffff888035fea2a8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888035feaf00 pfn:0x35fea
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88813fe3c3c0 ffff88813fe37288 ffffea0000e0b750
raw: ffff888035feaf00 000000080010000e 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 27330428082, free_ts 27310458759
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3269 [inline]
 allocate_slab mm/slub.c:3458 [inline]
 new_slab+0xa6/0x6d0 mm/slub.c:3516
 refill_objects+0x26b/0x400 mm/slub.c:7153
 refill_sheaf mm/slub.c:2818 [inline]
 alloc_full_sheaf mm/slub.c:2839 [inline]
 __pcs_replace_empty_main+0x19f/0x600 mm/slub.c:4602
 alloc_from_pcs mm/slub.c:4695 [inline]
 slab_alloc_node mm/slub.c:4829 [inline]
 __kmalloc_cache_noprof+0x493/0x6f0 mm/slub.c:5353
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 call_usermodehelper_setup+0xaf/0x360 kernel/umh.c:362
 kobject_uevent_env+0x17c1/0x18b0 lib/kobject_uevent.c:628
 kernel_add_sysfs_param kernel/params.c:810 [inline]
 param_sysfs_builtin kernel/params.c:845 [inline]
 param_sysfs_builtin_init+0x37b/0x3f0 kernel/params.c:981
 do_one_initcall+0x11d/0x760 init/main.c:1382
 do_initcall_level init/main.c:1444 [inline]
 do_initcalls init/main.c:1460 [inline]
 do_basic_setup init/main.c:1479 [inline]
 kernel_init_freeable+0x6e5/0x7a0 init/main.c:1692
 kernel_init+0x1f/0x1e0 init/main.c:1582
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 10 tgid 10 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0x7e1/0x10d0 mm/page_alloc.c:2978
 vfree.part.0+0x12b/0x9d0 mm/vmalloc.c:3479
 vfree mm/vmalloc.c:3456 [inline]
 delayed_vfree_work+0x8e/0xd0 mm/vmalloc.c:3398
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888035fea180: 00 00 00 04 fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888035fea200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888035fea280: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                                          ^
 ffff888035fea300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888035fea380: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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