================================================================== BUG: KASAN: slab-use-after-free in worker_thread+0xa99/0x12b0 kernel/workqueue.c:2550 Read of size 8 at addr ffff88811a714bf0 by task kworker/1:2/55 CPU: 1 PID: 55 Comm: kworker/1:2 Not tainted 6.4.0-rc3-syzkaller-g44c026a73be8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: 0x0 (usb_hub_wq) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x15d/0x540 mm/kasan/report.c:462 kasan_report+0x17c/0x1b0 mm/kasan/report.c:572 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:381 worker_thread+0xa99/0x12b0 kernel/workqueue.c:2550 kthread+0x2b6/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 373: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x99/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0xb4/0x1e0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x72/0x190 mm/util.c:604 kvmalloc include/linux/slab.h:697 [inline] kvzalloc include/linux/slab.h:705 [inline] alloc_netdev_mqs+0x8c/0x1020 net/core/dev.c:10626 alloc_etherdev_mqs+0x36/0x40 net/ethernet/eth.c:394 usbnet_probe+0x1a8/0x25b0 drivers/net/usb/usbnet.c:1698 usb_probe_interface+0x5b0/0xa80 drivers/usb/core/driver.c:396 really_probe+0x2aa/0x8c0 drivers/base/dd.c:658 __driver_probe_device+0x19d/0x310 drivers/base/dd.c:800 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:830 __device_attach_driver+0x2e3/0x490 drivers/base/dd.c:958 bus_for_each_drv+0x245/0x2d0 drivers/base/bus.c:457 __device_attach+0x336/0x4b0 drivers/base/dd.c:1030 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079 bus_probe_device+0x182/0x250 drivers/base/bus.c:532 device_add+0xaf2/0xde0 drivers/base/core.c:3625 usb_set_configuration+0x1a75/0x2000 drivers/usb/core/message.c:2211 usb_generic_driver_probe+0x8b/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13e/0x260 drivers/usb/core/driver.c:293 really_probe+0x2aa/0x8c0 drivers/base/dd.c:658 __driver_probe_device+0x19d/0x310 drivers/base/dd.c:800 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:830 __device_attach_driver+0x2e3/0x490 drivers/base/dd.c:958 bus_for_each_drv+0x245/0x2d0 drivers/base/bus.c:457 __device_attach+0x336/0x4b0 drivers/base/dd.c:1030 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079 bus_probe_device+0x182/0x250 drivers/base/bus.c:532 device_add+0xaf2/0xde0 drivers/base/core.c:3625 usb_new_device+0xf32/0x1810 drivers/usb/core/hub.c:2575 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x2c7b/0x49a0 drivers/usb/core/hub.c:5793 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2405 worker_thread+0xac3/0x12b0 kernel/workqueue.c:2552 kthread+0x2b6/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 373: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:236 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0x218/0x3b0 mm/slub.c:3799 kfree+0x7a/0xf0 mm/slab_common.c:1015 kvfree+0x35/0x40 mm/util.c:650 netdev_freemem+0x3f/0x60 net/core/dev.c:10580 netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1938 device_release+0x95/0x1c0 kobject_cleanup lib/kobject.c:683 [inline] kobject_release lib/kobject.c:714 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x178/0x260 lib/kobject.c:731 put_device+0x1f/0x30 drivers/base/core.c:3733 free_netdev+0x397/0x480 net/core/dev.c:10775 usbnet_disconnect+0x245/0x390 drivers/net/usb/usbnet.c:1637 usb_unbind_interface+0x1f4/0x8b0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x51d/0x7f0 drivers/base/dd.c:1295 device_release_driver+0x19/0x20 drivers/base/dd.c:1318 bus_remove_device+0x352/0x370 drivers/base/bus.c:574 device_del+0x514/0xd10 drivers/base/core.c:3814 usb_disable_device+0x383/0x720 drivers/usb/core/message.c:1420 usb_disconnect+0x32a/0x890 drivers/usb/core/hub.c:2238 hub_port_connect drivers/usb/core/hub.c:5246 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x1c75/0x49a0 drivers/usb/core/hub.c:5793 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2405 process_scheduled_works kernel/workqueue.c:2468 [inline] worker_thread+0xdd0/0x12b0 kernel/workqueue.c:2554 kthread+0x2b6/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:491 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:501 insert_work+0x56/0x310 kernel/workqueue.c:1365 __queue_work+0xa8b/0xe50 kernel/workqueue.c:1526 queue_work_on+0x105/0x170 kernel/workqueue.c:1554 usbnet_link_change+0xeb/0x100 usbnet_probe+0x1be0/0x25b0 drivers/net/usb/usbnet.c:1839 usb_probe_interface+0x5b0/0xa80 drivers/usb/core/driver.c:396 really_probe+0x2aa/0x8c0 drivers/base/dd.c:658 __driver_probe_device+0x19d/0x310 drivers/base/dd.c:800 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:830 __device_attach_driver+0x2e3/0x490 drivers/base/dd.c:958 bus_for_each_drv+0x245/0x2d0 drivers/base/bus.c:457 __device_attach+0x336/0x4b0 drivers/base/dd.c:1030 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079 bus_probe_device+0x182/0x250 drivers/base/bus.c:532 device_add+0xaf2/0xde0 drivers/base/core.c:3625 usb_set_configuration+0x1a75/0x2000 drivers/usb/core/message.c:2211 usb_generic_driver_probe+0x8b/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13e/0x260 drivers/usb/core/driver.c:293 really_probe+0x2aa/0x8c0 drivers/base/dd.c:658 __driver_probe_device+0x19d/0x310 drivers/base/dd.c:800 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:830 __device_attach_driver+0x2e3/0x490 drivers/base/dd.c:958 bus_for_each_drv+0x245/0x2d0 drivers/base/bus.c:457 __device_attach+0x336/0x4b0 drivers/base/dd.c:1030 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079 bus_probe_device+0x182/0x250 drivers/base/bus.c:532 device_add+0xaf2/0xde0 drivers/base/core.c:3625 usb_new_device+0xf32/0x1810 drivers/usb/core/hub.c:2575 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x2c7b/0x49a0 drivers/usb/core/hub.c:5793 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2405 worker_thread+0xac3/0x12b0 kernel/workqueue.c:2552 kthread+0x2b6/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88811a714000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3056 bytes inside of freed 4096-byte region [ffff88811a714000, ffff88811a715000) The buggy address belongs to the physical page: page:ffffea000469c400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a710 head:ffffea000469c400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4000000000010200(slab|head|zone=1) page_type: 0xffffffff() raw: 4000000000010200 ffff888100042140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 385, tgid 385 (kworker/1:4), ts 94961503591, free_ts 94183207920 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0x340e/0x34e0 mm/page_alloc.c:3502 __alloc_pages+0x3c2/0x7d0 mm/page_alloc.c:4768 allocate_slab mm/slub.c:1998 [inline] new_slab+0xce/0x4c0 mm/slub.c:2051 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3192 __slab_alloc mm/slub.c:3291 [inline] __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x1ed/0x2d0 mm/slub.c:3490 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] kobject_uevent_env+0x262/0x720 lib/kobject_uevent.c:524 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:642 device_add+0x86b/0xde0 drivers/base/core.c:3606 usb_set_configuration+0x1a75/0x2000 drivers/usb/core/message.c:2211 usb_generic_driver_probe+0x8b/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13e/0x260 drivers/usb/core/driver.c:293 really_probe+0x2aa/0x8c0 drivers/base/dd.c:658 __driver_probe_device+0x19d/0x310 drivers/base/dd.c:800 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:830 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x44a/0x690 mm/page_alloc.c:2564 free_unref_page+0x36/0x390 mm/page_alloc.c:2659 free_the_page mm/page_alloc.c:661 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:4857 __free_slab+0xc2/0x100 mm/slub.c:2068 free_slab+0x24/0xd0 mm/slub.c:2091 discard_slab mm/slub.c:2097 [inline] __unfreeze_partials+0x15f/0x180 mm/slub.c:2636 put_cpu_partial+0xa9/0x100 mm/slub.c:2712 __slab_free+0x1c8/0x280 mm/slub.c:3652 do_slab_free mm/slub.c:3730 [inline] ___cache_free+0xc6/0xd0 mm/slub.c:3793 qlink_free+0x4b/0x80 mm/kasan/quarantine.c:166 qlist_free_all+0x52/0xc0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14c/0x170 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x66/0x320 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] kmem_cache_alloc_node+0x195/0x350 mm/slub.c:3496 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct+0x5a/0x6b0 kernel/fork.c:1108 Memory state around the buggy address: ffff88811a714a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811a714b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811a714b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811a714c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811a714c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb 5-1: new high-speed USB device number 22 using dummy_hcd usb 5-1: Using ep0 maxpacket: 32 usb 5-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 5-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 32 usb 5-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 64 usb 5-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Product: syz usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz cdc_ncm 5-1:1.0: MAC-Address: 42:42:42:42:42:42 cdc_ncm 5-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 cdc_ncm 5-1:1.0: setting rx_max = 2048 cdc_ncm 5-1:1.0: setting tx_max = 184 cdc_ncm 5-1:1.0 usb0: register 'cdc_ncm' at usb-dummy_hcd.4-1, CDC NCM (NO ZLP), 42:42:42:42:42:42 usb 5-1: USB disconnect, device number 22 cdc_ncm 5-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.4-1, CDC NCM (NO ZLP) usb 5-1: new high-speed USB device number 23 using dummy_hcd usb 5-1: Using ep0 maxpacket: 32 usb 5-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 5-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 32 usb 5-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 64 usb 5-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Product: syz usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz cdc_ncm 5-1:1.0: MAC-Address: 42:42:42:42:42:42 cdc_ncm 5-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 cdc_ncm 5-1:1.0: setting rx_max = 2048 cdc_ncm 5-1:1.0: setting tx_max = 184 cdc_ncm 5-1:1.0 usb0: register 'cdc_ncm' at usb-dummy_hcd.4-1, CDC NCM (NO ZLP), 42:42:42:42:42:42 usb 5-1: USB disconnect, device number 23 cdc_ncm 5-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.4-1, CDC NCM (NO ZLP) usb 2-1: new high-speed USB device number 24 using dummy_hcd usb 2-1: Using ep0 maxpacket: 32 usb 2-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 2-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 32 usb 2-1: config 1 interface 1 altsetting 1 bulk endpoint 0x3 has invalid maxpacket 64 usb 2-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 2-1: Product: syz usb 2-1: Manufacturer: syz usb 2-1: SerialNumber: syz cdc_ncm 2-1:1.0: MAC-Address: 42:42:42:42:42:42 cdc_ncm 2-1:1.0: dwNtbInMaxSize=0 is too small. Using 2048 cdc_ncm 2-1:1.0: setting rx_max = 2048 cdc_ncm 2-1:1.0: setting tx_max = 184 cdc_ncm 2-1:1.0 usb0: register 'cdc_ncm' at usb-dummy_hcd.1-1, CDC NCM (NO ZLP), 42:42:42:42:42:42 usb 2-1: USB disconnect, device number 24 cdc_ncm 2-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.1-1, CDC NCM (NO ZLP) usb 5-1: new high-speed USB device number 25 using dummy_hcd