================================================================== BUG: KASAN: use-after-free in __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 Read of size 8 at addr ffff888112e44250 by task kworker/0:0/9 CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.14.0-rc6-syzkaller-g3a85c1011540 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events request_module_async 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+0xd9/0x110 mm/kasan/report.c:634 __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add_tail include/linux/list.h:183 [inline] em28xx_init_extension+0x48/0x200 drivers/media/usb/em28xx/em28xx-core.c:1114 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888112e44380 pfn:0x112e44 flags: 0x200000000000000(node=0|zone=2) page_type: f0(buddy) raw: 0200000000000000 ffffea0004c60308 ffffea000473ff08 0000000000000000 raw: ffff888112e44380 0000000000000002 00000000f0000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x40cc0(GFP_KERNEL|__GFP_COMP), pid 10155, tgid 10155 (kworker/1:3), ts 801517472102, free_ts 801869099572 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xe76/0x2b90 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x21c/0x2290 mm/page_alloc.c:4740 __alloc_pages_noprof+0xb/0x1b0 mm/page_alloc.c:4774 __alloc_pages_node_noprof include/linux/gfp.h:265 [inline] alloc_pages_node_noprof include/linux/gfp.h:292 [inline] ___kmalloc_large_node+0x84/0x1b0 mm/slub.c:4239 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4266 __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_track_caller_noprof.cold+0x5/0x5e mm/slub.c:4313 kmemdup_noprof+0x29/0x60 mm/util.c:135 kmemdup_noprof include/linux/fortify-string.h:765 [inline] em28xx_duplicate_dev drivers/media/usb/em28xx/em28xx-cards.c:3732 [inline] em28xx_usb_probe+0x16b6/0x3740 drivers/media/usb/em28xx/em28xx-cards.c:4082 usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030 page last free pid 10155 tgid 10155 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x653/0xde0 mm/page_alloc.c:2660 __folio_put+0x1e8/0x2d0 mm/swap.c:112 em28xx_free_device drivers/media/usb/em28xx/em28xx-cards.c:3566 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_usb_disconnect+0x4e0/0x610 drivers/media/usb/em28xx/em28xx-cards.c:4204 usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x122/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1273 [inline] device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1296 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579 device_del+0x396/0x9f0 drivers/base/core.c:3855 usb_disable_device+0x368/0x7e0 drivers/usb/core/message.c:1418 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2316 hub_port_connect drivers/usb/core/hub.c:5371 [inline] hub_port_connect_change drivers/usb/core/hub.c:5671 [inline] port_event drivers/usb/core/hub.c:5831 [inline] hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5913 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888112e44100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888112e44180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888112e44200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888112e44280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888112e44300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================