================================================================== BUG: KASAN: use-after-free in worker_thread+0xb0e/0x1390 kernel/workqueue.c:2434 Read of size 8 at addr ffff8881162cab30 by task kworker/0:6/785 CPU: 0 PID: 785 Comm: kworker/0:6 Not tainted 6.1.0-rc8-syzkaller-00003-gbce9332220bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: 0x0 (pm) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x164/0x510 mm/kasan/report.c:395 kasan_report+0x13f/0x170 mm/kasan/report.c:495 __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:306 Allocated by task 19: 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:500 ____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:955 [inline] __kmalloc_node+0xb0/0x1e0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x72/0x190 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] kvzalloc include/linux/slab.h:714 [inline] alloc_netdev_mqs+0x8c/0xd50 net/core/dev.c:10588 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:3517 usb_set_configuration+0x1a91/0x2010 drivers/usb/core/message.c:2170 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:3517 usb_new_device+0xba4/0x1770 drivers/usb/core/hub.c:2573 hub_port_connect drivers/usb/core/hub.c:5353 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5653 [inline] hub_event+0x2c36/0x5020 drivers/usb/core/hub.c:5735 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:306 Freed by task 19: 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:511 ____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:1724 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xbb/0x160 mm/slub.c:3674 kfree+0x7a/0xf0 mm/slab_common.c:1007 kvfree+0x35/0x40 mm/util.c:627 netdev_freemem+0x3e/0x60 net/core/dev.c:10542 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:3624 free_netdev+0x3a6/0x490 net/core/dev.c:10735 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:1249 [inline] device_release_driver_internal+0x548/0x870 drivers/base/dd.c:1275 device_release_driver+0x19/0x20 drivers/base/dd.c:1298 bus_remove_device+0x2c7/0x330 drivers/base/bus.c:529 device_del+0x618/0xe90 drivers/base/core.c:3704 usb_disable_device+0x3a4/0x710 drivers/usb/core/message.c:1419 usb_disconnect+0x342/0x880 drivers/usb/core/hub.c:2235 hub_port_connect drivers/usb/core/hub.c:5197 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5653 [inline] hub_event+0x1f1d/0x5020 drivers/usb/core/hub.c:5735 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:306 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:481 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:491 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:3517 usb_set_configuration+0x1a91/0x2010 drivers/usb/core/message.c:2170 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:3517 usb_new_device+0xba4/0x1770 drivers/usb/core/hub.c:2573 hub_port_connect drivers/usb/core/hub.c:5353 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5653 [inline] hub_event+0x2c36/0x5020 drivers/usb/core/hub.c:5735 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:306 The buggy address belongs to the object at ffff8881162ca000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2864 bytes inside of 4096-byte region [ffff8881162ca000, ffff8881162cb000) The buggy address belongs to the physical page: page:ffffea000458b200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1162c8 head:ffffea000458b200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100042140 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 527, tgid 527 (udevd), ts 90868573025, free_ts 90733075532 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1eb/0x1f0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x375/0x3f0 mm/page_alloc.c:4291 __alloc_pages+0x3d1/0x7c0 mm/page_alloc.c:5558 allocate_slab+0xb3/0x530 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x4da/0x940 mm/slub.c:3180 __slab_alloc+0x5d/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x1f1/0x290 mm/slub.c:3437 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1045 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] uevent_show+0x15b/0x320 drivers/base/core.c:2487 dev_attr_show+0x56/0xd0 drivers/base/core.c:2195 sysfs_kf_seq_show+0x279/0x3a0 fs/sysfs/file.c:59 kernfs_seq_show+0x10e/0x160 fs/kernfs/file.c:201 seq_read_iter+0x429/0xd20 fs/seq_file.c:230 kernfs_fop_read_iter+0x15e/0x480 fs/kernfs/file.c:275 call_read_iter include/linux/fs.h:2193 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x740/0xb00 fs/read_write.c:470 ksys_read+0x198/0x2c0 fs/read_write.c:613 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x4d0/0x4e0 mm/page_alloc.c:1532 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x70/0x530 mm/page_alloc.c:3483 free_the_page mm/page_alloc.c:770 [inline] __free_pages+0xd8/0x100 mm/page_alloc.c:5644 __free_slab+0xd2/0x1b0 mm/slub.c:2016 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x17d/0x1b0 mm/slub.c:2586 put_cpu_partial+0xa9/0x100 mm/slub.c:2662 __slab_free+0x203/0x280 mm/slub.c:3538 do_slab_free mm/slub.c:3615 [inline] ___cache_free+0xc6/0xd0 mm/slub.c:3668 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:168 qlist_free_all+0x5a/0xd0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x18f/0x300 mm/slub.c:3422 mt_alloc_one lib/maple_tree.c:152 [inline] mas_alloc_nodes+0x203/0x650 lib/maple_tree.c:1226 mas_node_count_gfp lib/maple_tree.c:1310 [inline] mas_preallocate+0x12e/0x340 lib/maple_tree.c:5717 __vma_adjust+0x5c1/0x18e0 mm/mmap.c:716 Memory state around the buggy address: ffff8881162caa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881162caa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881162cab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881162cab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881162cac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb 2-1: new high-speed USB device number 28 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 usb1: 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 28 cdc_ncm 2-1:1.0 usb1: unregister 'cdc_ncm' usb-dummy_hcd.1-1, CDC NCM (NO ZLP)