================================================================== 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+0x4ba/0xe40 drivers/video/fbdev/core/fbcon.c:685 Read of size 256 at addr ffff8880785e3160 by task kworker/1:2/1632 CPU: 1 UID: 0 PID: 1632 Comm: kworker/1:2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 scr_memcpyw include/linux/vt_buffer.h:38 [inline] fbcon_prepare_logo+0x4ba/0xe40 drivers/video/fbdev/core/fbcon.c:685 fbcon_init+0x10fd/0x1b30 drivers/video/fbdev/core/fbcon.c:1227 visual_init+0x2e3/0x660 drivers/tty/vt/vt.c:1048 do_bind_con_driver+0x86f/0x1040 drivers/tty/vt/vt.c:4054 do_take_over_console+0x888/0xa10 drivers/tty/vt/vt.c:4594 do_fbcon_takeover+0x119/0x200 drivers/video/fbdev/core/fbcon.c:620 do_fb_registered drivers/video/fbdev/core/fbcon.c:3007 [inline] fbcon_fb_registered+0x361/0x610 drivers/video/fbdev/core/fbcon.c:3031 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:538 [inline] register_framebuffer+0x6e8/0x880 drivers/video/fbdev/core/fbmem.c:605 __drm_fb_helper_initial_config_and_unlock+0x1555/0x1b50 drivers/gpu/drm/drm_fb_helper.c:1746 drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66 drm_client_register+0x16e/0x200 drivers/gpu/drm/drm_client.c:143 drm_fbdev_client_setup+0x1a0/0x450 drivers/gpu/drm/clients/drm_fbdev_client.c:168 drm_client_setup+0x107/0x220 drivers/gpu/drm/clients/drm_client_setup.c:46 gud_probe+0x11b9/0x13b0 drivers/gpu/drm/gud/gud_drv.c:653 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2708 hub_port_connect drivers/usb/core/hub.c:5580 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5966 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880785e23c0 pfn:0x785e0 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f8(unknown) raw: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000 raw: ffff8880785e23c0 0000000000000000 00000000f8000000 0000000000000000 head: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000 head: ffff8880785e23c0 0000000000000000 00000000f8000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_ZERO|__GFP_COMP), pid 1632, tgid 1632 (kworker/1:2), ts 848883157554 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486 ___kmalloc_large_node+0x4f/0x120 mm/slub.c:5353 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5385 __do_kmalloc_node mm/slub.c:5402 [inline] __kmalloc_noprof+0x3fb/0x720 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] vc_do_resize+0x345/0x1550 drivers/tty/vt/vt.c:1211 vc_resize include/linux/vt_kern.h:49 [inline] fbcon_init+0x10d0/0x1b30 drivers/video/fbdev/core/fbcon.c:1224 visual_init+0x2e3/0x660 drivers/tty/vt/vt.c:1048 do_bind_con_driver+0x86f/0x1040 drivers/tty/vt/vt.c:4054 do_take_over_console+0x888/0xa10 drivers/tty/vt/vt.c:4594 do_fbcon_takeover+0x119/0x200 drivers/video/fbdev/core/fbcon.c:620 do_fb_registered drivers/video/fbdev/core/fbcon.c:3007 [inline] fbcon_fb_registered+0x361/0x610 drivers/video/fbdev/core/fbcon.c:3031 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:538 [inline] register_framebuffer+0x6e8/0x880 drivers/video/fbdev/core/fbmem.c:605 __drm_fb_helper_initial_config_and_unlock+0x1555/0x1b50 drivers/gpu/drm/drm_fb_helper.c:1746 page last free pid 1632 tgid 1632 ts 848853988634 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 stack_depot_save_flags+0x41e/0x7f0 lib/stackdepot.c:735 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kmalloc_node_track_caller_noprof+0x4b4/0x720 mm/slub.c:5545 kvasprintf+0xeb/0x1a0 lib/kasprintf.c:25 kobject_set_name_vargs+0x61/0x110 lib/kobject.c:274 device_create_groups_vargs drivers/base/core.c:4454 [inline] device_create_with_groups+0x23e/0x300 drivers/base/core.c:4538 do_register_con_driver drivers/tty/vt/vt.c:4477 [inline] do_take_over_console+0x815/0xa10 drivers/tty/vt/vt.c:4585 do_fbcon_takeover+0x119/0x200 drivers/video/fbdev/core/fbcon.c:620 do_fb_registered drivers/video/fbdev/core/fbcon.c:3007 [inline] fbcon_fb_registered+0x361/0x610 drivers/video/fbdev/core/fbcon.c:3031 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:538 [inline] register_framebuffer+0x6e8/0x880 drivers/video/fbdev/core/fbmem.c:605 __drm_fb_helper_initial_config_and_unlock+0x1555/0x1b50 drivers/gpu/drm/drm_fb_helper.c:1746 drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66 drm_client_register+0x16e/0x200 drivers/gpu/drm/drm_client.c:143 drm_fbdev_client_setup+0x1a0/0x450 drivers/gpu/drm/clients/drm_fbdev_client.c:168 Memory state around the buggy address: ffff8880785e3000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff8880785e3080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff8880785e3100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffff8880785e3180: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff8880785e3200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ==================================================================