================================================================== BUG: KASAN: use-after-free in worker_thread+0xb0e/0x1390 kernel/workqueue.c:2434 Read of size 8 at addr ffff888111348b30 by task kworker/1:4/412 CPU: 1 PID: 412 Comm: kworker/1:4 Not tainted 6.1.0-syzkaller-14364-g9d2f6060fe4c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: 0x0 (rcu_gp) 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:306 [inline] print_report+0x164/0x510 mm/kasan/report.c:417 kasan_report+0x13f/0x170 mm/kasan/report.c:517 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351 worker_thread+0xb0e/0x1390 kernel/workqueue.c:2434 kthread+0x26b/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 955: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:507 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc_node+0xb0/0x1e0 mm/slab_common.c:975 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x190 mm/util.c:581 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] alloc_netdev_mqs+0x8c/0xd50 net/core/dev.c:10586 alloc_etherdev_mqs+0x36/0x40 net/ethernet/eth.c:394 usbnet_probe+0x186/0x2580 drivers/net/usb/usbnet.c:1693 usb_probe_interface+0x632/0xae0 drivers/usb/core/driver.c:396 really_probe+0x2af/0x910 drivers/base/dd.c:639 __driver_probe_device+0x1b4/0x280 drivers/base/dd.c:778 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:808 __device_attach_driver+0x2dd/0x490 drivers/base/dd.c:936 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427 __device_attach+0x322/0x530 drivers/base/dd.c:1008 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1057 bus_probe_device+0xb9/0x1e0 drivers/base/bus.c:487 device_add+0xb15/0xed0 drivers/base/core.c:3479 usb_set_configuration+0x1a41/0x1fb0 drivers/usb/core/message.c:2171 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13a/0x240 drivers/usb/core/driver.c:293 really_probe+0x2af/0x910 drivers/base/dd.c:639 __driver_probe_device+0x1b4/0x280 drivers/base/dd.c:778 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:808 __device_attach_driver+0x2dd/0x490 drivers/base/dd.c:936 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427 __device_attach+0x322/0x530 drivers/base/dd.c:1008 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1057 bus_probe_device+0xb9/0x1e0 drivers/base/bus.c:487 device_add+0xb15/0xed0 drivers/base/core.c:3479 usb_new_device+0xba4/0x1770 drivers/usb/core/hub.c:2573 hub_port_connect drivers/usb/core/hub.c:5405 [inline] hub_port_connect_change drivers/usb/core/hub.c:5549 [inline] port_event drivers/usb/core/hub.c:5709 [inline] hub_event+0x2c93/0x4a80 drivers/usb/core/hub.c:5791 process_one_work+0x6cb/0xc00 kernel/workqueue.c:2289 worker_thread+0xb3c/0x1390 kernel/workqueue.c:2436 kthread+0x26b/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 955: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:518 ____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:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xbb/0x160 mm/slub.c:3800 kfree+0x7a/0xf0 mm/slab_common.c:1020 kvfree+0x35/0x40 mm/util.c:627 netdev_freemem+0x3e/0x60 net/core/dev.c:10540 netdev_release+0x79/0xa0 net/core/net-sysfs.c:1910 device_release+0x9c/0x1d0 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x163/0x240 lib/kobject.c:721 put_device+0x1f/0x30 drivers/base/core.c:3586 free_netdev+0x3a6/0x490 net/core/dev.c:10733 usbnet_disconnect+0x267/0x3a0 drivers/net/usb/usbnet.c:1632 usb_unbind_interface+0x206/0x8d0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1253 [inline] device_release_driver_internal+0x548/0x870 drivers/base/dd.c:1279 device_release_driver+0x19/0x20 drivers/base/dd.c:1302 bus_remove_device+0x2c7/0x330 drivers/base/bus.c:529 device_del+0x618/0xe90 drivers/base/core.c:3666 usb_disable_device+0x3a4/0x710 drivers/usb/core/message.c:1420 usb_disconnect+0x342/0x880 drivers/usb/core/hub.c:2235 hub_port_connect drivers/usb/core/hub.c:5244 [inline] hub_port_connect_change drivers/usb/core/hub.c:5549 [inline] port_event drivers/usb/core/hub.c:5709 [inline] hub_event+0x1e4e/0x4a80 drivers/usb/core/hub.c:5791 process_one_work+0x6cb/0xc00 kernel/workqueue.c:2289 process_scheduled_works kernel/workqueue.c:2352 [inline] worker_thread+0xe64/0x1390 kernel/workqueue.c:2438 kthread+0x26b/0x300 kernel/kthread.c:376 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:488 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:498 insert_work+0x56/0x320 kernel/workqueue.c:1358 __queue_work+0x9e1/0xda0 kernel/workqueue.c:1517 queue_work_on+0xf2/0x170 kernel/workqueue.c:1545 usbnet_link_change+0xe6/0x100 usbnet_probe+0x1be3/0x2580 drivers/net/usb/usbnet.c:1834 usb_probe_interface+0x632/0xae0 drivers/usb/core/driver.c:396 really_probe+0x2af/0x910 drivers/base/dd.c:639 __driver_probe_device+0x1b4/0x280 drivers/base/dd.c:778 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:808 __device_attach_driver+0x2dd/0x490 drivers/base/dd.c:936 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427 __device_attach+0x322/0x530 drivers/base/dd.c:1008 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1057 bus_probe_device+0xb9/0x1e0 drivers/base/bus.c:487 device_add+0xb15/0xed0 drivers/base/core.c:3479 usb_set_configuration+0x1a41/0x1fb0 drivers/usb/core/message.c:2171 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13a/0x240 drivers/usb/core/driver.c:293 really_probe+0x2af/0x910 drivers/base/dd.c:639 __driver_probe_device+0x1b4/0x280 drivers/base/dd.c:778 driver_probe_device+0x54/0x3d0 drivers/base/dd.c:808 __device_attach_driver+0x2dd/0x490 drivers/base/dd.c:936 bus_for_each_drv+0x18a/0x210 drivers/base/bus.c:427 __device_attach+0x322/0x530 drivers/base/dd.c:1008 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1057 bus_probe_device+0xb9/0x1e0 drivers/base/bus.c:487 device_add+0xb15/0xed0 drivers/base/core.c:3479 usb_new_device+0xba4/0x1770 drivers/usb/core/hub.c:2573 hub_port_connect drivers/usb/core/hub.c:5405 [inline] hub_port_connect_change drivers/usb/core/hub.c:5549 [inline] port_event drivers/usb/core/hub.c:5709 [inline] hub_event+0x2c93/0x4a80 drivers/usb/core/hub.c:5791 process_one_work+0x6cb/0xc00 kernel/workqueue.c:2289 worker_thread+0xb3c/0x1390 kernel/workqueue.c:2436 kthread+0x26b/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff888111348000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2864 bytes inside of 4096-byte region [ffff888111348000, ffff888111349000) The buggy address belongs to the physical page: page:ffffea000444d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111348 head:ffffea000444d200 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffff888100042140 0000000000000000 dead000000000001 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 96, tgid 96 (udevadm), ts 4757104328, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1eb/0x1f0 mm/page_alloc.c:2524 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x375/0x3f0 mm/page_alloc.c:4283 __alloc_pages+0x3d1/0x7c0 mm/page_alloc.c:5549 allocate_slab+0xb2/0x410 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x4da/0x940 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x222/0x310 mm/slub.c:3491 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] kobject_uevent_env+0x265/0x730 lib/kobject_uevent.c:524 kobject_synth_uevent+0x3c4/0x930 lib/kobject_uevent.c:208 uevent_store+0x4b/0x70 drivers/base/bus.c:581 drv_attr_store+0x78/0xa0 drivers/base/bus.c:77 sysfs_kf_write+0x123/0x140 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x2cd/0x410 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2186 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x8b5/0xef0 fs/read_write.c:584 ksys_write+0x198/0x2c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 page_owner free stack trace missing Memory state around the buggy address: ffff888111348a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888111348a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888111348b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888111348b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888111348c00: 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 49 using dummy_hcd 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 49 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 50 using dummy_hcd 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 50 cdc_ncm 2-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.1-1, CDC NCM (NO ZLP) usb 3-1: new high-speed USB device number 51 using dummy_hcd