==================================================================
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 8 at addr ffff888022be7b60 by task syz.0.963/10219

CPU: 1 UID: 0 PID: 10219 Comm: syz.0.963 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
 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdca459c799
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:00007fdca5476028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdca4815fa0 RCX: 00007fdca459c799
RDX: 0000000000000084 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fdca4632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdca4816038 R14: 00007fdca4815fa0 R15: 00007ffde3da2408
 </TASK>

Allocated by task 10219:
 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:5263 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5275
 kmalloc_noprof include/linux/slab.h:954 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 drm_atomic_state_init+0xf4/0x490 drivers/gpu/drm/drm_atomic.c:135
 drm_atomic_state_alloc drivers/gpu/drm/drm_atomic.c:181 [inline]
 drm_atomic_state_alloc+0xd3/0x120 drivers/gpu/drm/drm_atomic.c:171
 drm_client_modeset_commit_atomic+0xcc/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1045
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1207
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1207 [inline]
 drm_fb_helper_pan_display+0x32d/0xa40 drivers/gpu/drm/drm_fb_helper.c:1267
 fb_pan_display+0x195/0x820 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x48/0x1f0 drivers/video/fbdev/core/bitblit.c:405
 fbcon_switch+0x112f/0x1a00 drivers/video/fbdev/core/fbcon.c:2211
 redraw_screen+0x2c1/0x760 drivers/tty/vt/vt.c:960
 vc_do_resize+0xe1a/0x10f0 drivers/tty/vt/vt.c:1275
 vc_resize include/linux/vt_kern.h:49 [inline]
 fbcon_init+0x10ba/0x1820 drivers/video/fbdev/core/fbcon.c:1177
 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
 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10219:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2692 [inline]
 slab_free mm/slub.c:6168 [inline]
 kfree+0x1f6/0x6b0 mm/slub.c:6486
 drm_atomic_state_default_release drivers/gpu/drm/drm_atomic.c:109 [inline]
 __drm_atomic_state_free+0x1df/0x2f0 drivers/gpu/drm/drm_atomic.c:338
 kref_put include/linux/kref.h:65 [inline]
 drm_atomic_state_put include/drm/drm_atomic.h:697 [inline]
 drm_client_modeset_commit_atomic+0x5f3/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1110
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1207
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1207 [inline]
 drm_fb_helper_pan_display+0x32d/0xa40 drivers/gpu/drm/drm_fb_helper.c:1267
 fb_pan_display+0x195/0x820 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x48/0x1f0 drivers/video/fbdev/core/bitblit.c:405
 fbcon_switch+0x112f/0x1a00 drivers/video/fbdev/core/fbcon.c:2211
 redraw_screen+0x2c1/0x760 drivers/tty/vt/vt.c:960
 vc_do_resize+0xe1a/0x10f0 drivers/tty/vt/vt.c:1275
 vc_resize include/linux/vt_kern.h:49 [inline]
 fbcon_init+0x10ba/0x1820 drivers/video/fbdev/core/fbcon.c:1177
 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
 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888022be7b00
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 32 bytes to the right of
 allocated 64-byte region [ffff888022be7b00, ffff888022be7b40)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22be7
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fe3c8c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800200020 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 322, tgid 322 (kworker/u8:6), ts 5655185360, free_ts 5113885411
 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:3296 [inline]
 allocate_slab mm/slub.c:3485 [inline]
 new_slab+0xa6/0x6c0 mm/slub.c:3543
 refill_objects+0x26b/0x400 mm/slub.c:7178
 refill_sheaf mm/slub.c:2818 [inline]
 alloc_full_sheaf mm/slub.c:2839 [inline]
 __pcs_replace_empty_main+0x1ab/0x600 mm/slub.c:4629
 alloc_from_pcs mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:4854 [inline]
 __do_kmalloc_node mm/slub.c:5262 [inline]
 __kmalloc_noprof+0x688/0x850 mm/slub.c:5275
 kmalloc_noprof include/linux/slab.h:954 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 lsm_blob_alloc+0x68/0x90 security/security.c:192
 lsm_task_alloc security/security.c:244 [inline]
 security_task_alloc+0x2a/0x260 security/security.c:2682
 copy_process+0x2531/0x7a10 kernel/fork.c:2205
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
 user_mode_thread+0xcc/0x110 kernel/fork.c:2730
 call_usermodehelper_exec_work kernel/umh.c:171 [inline]
 call_usermodehelper_exec_work+0xcb/0x180 kernel/umh.c:157
 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:436
page last free pid 24 tgid 24 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:436
 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:
 ffff888022be7a00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888022be7a80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888022be7b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                                       ^
 ffff888022be7b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888022be7c00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================