smsc95xx 6-1:1.0 eth1 (unregistering): Failed to read reg index 0x00000114: -19 smsc95xx 6-1:1.0 eth1 (unregistering): Error reading MII_ACCESS ================================================================== BUG: KASAN: use-after-free in __smsc95xx_mdio_read drivers/net/usb/smsc95xx.c:188 [inline] BUG: KASAN: use-after-free in smsc95xx_mdio_read+0x251/0x870 drivers/net/usb/smsc95xx.c:278 Read of size 8 at addr ffff8881c75889c8 by task kworker/1:2/91 CPU: 1 PID: 91 Comm: kworker/1:2 Not tainted 5.4.47-syzkaller-00290-g5eb96e454e88 #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 __smsc95xx_mdio_read drivers/net/usb/smsc95xx.c:188 [inline] smsc95xx_mdio_read+0x251/0x870 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 3116: 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 3116: 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 ffff8881c7588000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2504 bytes inside of 4096-byte region [ffff8881c7588000, ffff8881c7589000) The buggy address belongs to the page: page:ffffea00071d6200 refcount:1 mapcount:0 mapping:ffff8881da80c280 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881da80c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881c7588880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c7588900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881c7588980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881c7588a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c7588a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb ρ, (unnamed net_device) (released): MII is busy in smsc95xx_mdio_read usb ρ, (unnamed net_device) (released): Failed to read MII_BMSR usb 4-1: new high-speed USB device number 17 using dummy_hcd usb 4-1: unable to get BOS descriptor or descriptor too short usb 4-1: config 1 has an invalid interface number: 2 but max is 1 usb 4-1: config 1 contains an unexpected descriptor of type 0x1, skipping usb 4-1: config 1 has an invalid descriptor of length 0, skipping remainder of the config usb 4-1: config 1 has 1 interface, different from the descriptor's value: 2 usb 4-1: config 1 has no interface number 0 usb 4-1: config 1 interface 2 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 1 usb 4-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz cdc_ncm 4-1:1.2: skipping garbage cdc_ncm 4-1:1.2: skipping garbage cdc_ncm 4-1:1.2: invalid descriptor buffer length cdc_ncm 4-1:1.2: bind() failure usb 4-1: USB disconnect, device number 17 usb 4-1: new high-speed USB device number 18 using dummy_hcd usb 4-1: unable to get BOS descriptor or descriptor too short usb 4-1: config 1 has an invalid interface number: 2 but max is 1 usb 4-1: config 1 contains an unexpected descriptor of type 0x1, skipping usb 4-1: config 1 has an invalid descriptor of length 0, skipping remainder of the config usb 4-1: config 1 has 1 interface, different from the descriptor's value: 2 usb 4-1: config 1 has no interface number 0 usb 4-1: config 1 interface 2 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 1 usb 4-1: New USB device found, idVendor=0525, idProduct=a4a1, bcdDevice= 0.40 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz cdc_ncm 4-1:1.2: skipping garbage cdc_ncm 4-1:1.2: skipping garbage cdc_ncm 4-1:1.2: invalid descriptor buffer length cdc_ncm 4-1:1.2: bind() failure usb 4-1: USB disconnect, device number 18