smsc95xx 5-1:1.0 eth1 (unregistering): MII is busy in smsc95xx_mdio_read ================================================================== BUG: KASAN: use-after-free in atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:1463 [inline] BUG: KASAN: use-after-free in atomic_long_cmpxchg_release include/asm-generic/atomic-long.h:424 [inline] BUG: KASAN: use-after-free in __mutex_unlock_fast kernel/locking/mutex.c:181 [inline] BUG: KASAN: use-after-free in mutex_unlock+0x19/0x40 kernel/locking/mutex.c:737 Write of size 8 at addr ffff88819bd26940 by task kworker/0:3/210 CPU: 0 PID: 210 Comm: kworker/0:3 Not tainted 5.4.46-syzkaller-00106-ga191332e9e93 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events check_carrier Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x14a/0x1ce lib/dump_stack.c:118 print_address_description+0x93/0x620 mm/kasan/report.c:374 __kasan_report+0x16d/0x1e0 mm/kasan/report.c:506 kasan_report+0x34/0x60 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:181 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:191 atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:1463 [inline] atomic_long_cmpxchg_release include/asm-generic/atomic-long.h:424 [inline] __mutex_unlock_fast kernel/locking/mutex.c:181 [inline] mutex_unlock+0x19/0x40 kernel/locking/mutex.c:737 __smsc95xx_mdio_read drivers/net/usb/smsc95xx.c:217 [inline] smsc95xx_mdio_read+0x583/0x870 drivers/net/usb/smsc95xx.c:278 check_carrier+0xd1/0x2e0 drivers/net/usb/smsc95xx.c:644 process_one_work+0x777/0xf90 kernel/workqueue.c:2274 worker_thread+0xa8f/0x1430 kernel/workqueue.c:2420 kthread+0x2df/0x300 kernel/kthread.c:255 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 12: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x12c/0x1c0 mm/kasan/common.c:510 __kmalloc+0xf7/0x2d0 mm/slub.c:3821 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0xc2/0x120 mm/util.c:564 kvmalloc include/linux/mm.h:678 [inline] kvzalloc include/linux/mm.h:686 [inline] alloc_netdev_mqs+0x85/0xc60 net/core/dev.c:9498 usbnet_probe+0x1ae/0x2770 drivers/net/usb/usbnet.c:1686 usb_probe_interface+0x631/0xad0 drivers/usb/core/driver.c:361 really_probe+0x764/0xf70 drivers/base/dd.c:560 driver_probe_device+0xe6/0x230 drivers/base/dd.c:729 bus_for_each_drv+0x17a/0x200 drivers/base/bus.c:430 __device_attach+0x27b/0x420 drivers/base/dd.c:902 bus_probe_device+0xbb/0x200 drivers/base/bus.c:490 device_add+0x13db/0x17c0 drivers/base/core.c:2644 usb_set_configuration+0x197f/0x1f00 drivers/usb/core/message.c:2030 generic_probe+0x82/0x140 drivers/usb/core/generic.c:210 really_probe+0x764/0xf70 drivers/base/dd.c:560 driver_probe_device+0xe6/0x230 drivers/base/dd.c:729 bus_for_each_drv+0x17a/0x200 drivers/base/bus.c:430 __device_attach+0x27b/0x420 drivers/base/dd.c:902 bus_probe_device+0xbb/0x200 drivers/base/bus.c:490 device_add+0x13db/0x17c0 drivers/base/core.c:2644 usb_new_device+0xda7/0x1710 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5123 [inline] hub_port_connect_change drivers/usb/core/hub.c:5238 [inline] port_event drivers/usb/core/hub.c:5384 [inline] hub_event+0x2963/0x4fa0 drivers/usb/core/hub.c:5466 process_one_work+0x777/0xf90 kernel/workqueue.c:2274 worker_thread+0xa8f/0x1430 kernel/workqueue.c:2420 kthread+0x2df/0x300 kernel/kthread.c:255 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Freed by task 2959: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x181/0x230 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1424 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1457 slab_free mm/slub.c:3014 [inline] kfree+0x12b/0x600 mm/slub.c:3975 device_release+0x70/0x1a0 drivers/base/core.c:1519 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1a9/0x250 lib/kobject.c:739 usb_unbind_interface+0x1d8/0x850 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1142 [inline] device_release_driver_internal+0x515/0x7b0 drivers/base/dd.c:1173 bus_remove_device+0x2e7/0x350 drivers/base/bus.c:532 device_del+0x7bc/0x1200 drivers/base/core.c:2821 usb_disable_device+0x3fe/0xc90 drivers/usb/core/message.c:1244 usb_disconnect+0x341/0x880 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:4974 [inline] hub_port_connect_change drivers/usb/core/hub.c:5238 [inline] port_event drivers/usb/core/hub.c:5384 [inline] hub_event+0x1c6c/0x4fa0 drivers/usb/core/hub.c:5466 process_one_work+0x777/0xf90 kernel/workqueue.c:2274 worker_thread+0xa8f/0x1430 kernel/workqueue.c:2420 kthread+0x2df/0x300 kernel/kthread.c:255 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88819bd26000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2368 bytes inside of 4096-byte region [ffff88819bd26000, ffff88819bd27000) Memory state around the buggy address: ffff88819bd26800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88819bd26880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88819bd26900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88819bd26980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88819bd26a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb (unnamed net_device) (released): Failed to read MII_BMSR smsc95xx 5-1:1.0 eth1: unregister 'smsc95xx' usb-dummy_hcd.4-1, smsc95xx USB 2.0 Ethernet usb 5-1: Using ep0 maxpacket: 8 usb 5-1: config 1 interface 0 altsetting 0 bulk endpoint 0x3 has invalid maxpacket 564 usb 5-1: config 1 interface 0 altsetting 0 has 2 endpoint descriptors, different from the interface descriptor's value: 3 usb 5-1: New USB device found, idVendor=0424, idProduct=9e00, bcdDevice= 0.40 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz usb 5-1: bad CDC descriptors smsc95xx v1.0.6 smsc95xx 5-1:1.0 (unnamed net_device) (uninitialized): Error reading E2P_CMD smsc95xx 5-1:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x00000114: -32 smsc95xx 5-1:1.0 (unnamed net_device) (uninitialized): Error reading MII_ACCESS smsc95xx 5-1:1.0 (unnamed net_device) (uninitialized): MII is busy in smsc95xx_mdio_read smsc95xx 5-1:1.0 eth1: register 'smsc95xx' at usb-dummy_hcd.4-1, smsc95xx USB 2.0 Ethernet, b6:78:93:f9:51:03 smsc95xx 5-1:1.0 eth1: unregister 'smsc95xx' usb-dummy_hcd.4-1, smsc95xx USB 2.0 Ethernet usb 5-1: Using ep0 maxpacket: 8 usb 5-1: config 1 interface 0 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 247 usb 5-1: config 1 interface 0 altsetting 0 bulk endpoint 0x3 has invalid maxpacket 564 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 usb 5-1: bad CDC descriptors smsc95xx v1.0.6