usb 2-1: USB disconnect, device number 8 ================================================================== BUG: KASAN: slab-use-after-free in hdm_disconnect+0x1fc/0x220 drivers/most/most_usb.c:1125 Read of size 8 at addr ffffaf8018c1d8a0 by task kworker/0:2/925 CPU: 0 UID: 0 PID: 925 Comm: kworker/0:2 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Workqueue: usb_hub_wq hub_event Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] print_address_description mm/kasan/report.c:408 [inline] [] print_report+0x28e/0x5fe mm/kasan/report.c:521 [] kasan_report+0xf0/0x214 mm/kasan/report.c:634 [] __asan_report_load8_noabort+0x12/0x1a mm/kasan/report_generic.c:381 [] hdm_disconnect+0x1fc/0x220 drivers/most/most_usb.c:1125 [] usb_unbind_interface+0x1b4/0x86c drivers/usb/core/driver.c:458 [] device_remove drivers/base/dd.c:569 [inline] [] device_remove+0x11a/0x15c drivers/base/dd.c:561 [] __device_release_driver drivers/base/dd.c:1272 [inline] [] device_release_driver_internal+0x3f0/0x572 drivers/base/dd.c:1295 [] device_release_driver+0x1e/0x28 drivers/base/dd.c:1318 [] bus_remove_device+0x1f4/0x3d2 drivers/base/bus.c:579 [] device_del+0x324/0x898 drivers/base/core.c:3881 [] usb_disable_device+0x2fa/0x6f8 drivers/usb/core/message.c:1418 [] usb_disconnect+0x28a/0x830 drivers/usb/core/hub.c:2316 [] hub_port_connect drivers/usb/core/hub.c:5375 [inline] [] hub_port_connect_change drivers/usb/core/hub.c:5675 [inline] [] port_event drivers/usb/core/hub.c:5835 [inline] [] hub_event+0x1982/0x48de drivers/usb/core/hub.c:5917 [] process_one_work+0x96a/0x1f32 kernel/workqueue.c:3238 [] process_scheduled_works kernel/workqueue.c:3321 [inline] [] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3402 [] kthread+0x39c/0x7d4 kernel/kthread.c:464 [] ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 [] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 Allocated by task 3913: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_alloc_info+0x30/0x3e mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xa0/0xa6 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x15a/0x3e8 mm/slub.c:4359 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] hdm_probe+0xb2/0x17c4 drivers/most/most_usb.c:959 usb_probe_interface+0x2d6/0x8c4 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x232/0x9be drivers/base/dd.c:657 __driver_probe_device+0x1d4/0x3f2 drivers/base/dd.c:799 driver_probe_device+0x60/0x1ce drivers/base/dd.c:829 __device_attach_driver+0x1e2/0x2fc drivers/base/dd.c:957 bus_for_each_drv+0x142/0x1da drivers/base/bus.c:462 __device_attach+0x1c4/0x462 drivers/base/dd.c:1029 device_initial_probe+0x1c/0x26 drivers/base/dd.c:1078 bus_probe_device+0x15c/0x192 drivers/base/bus.c:537 device_add+0x10da/0x181c drivers/base/core.c:3692 usb_set_configuration+0xf08/0x19dc drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xae/0x128 drivers/usb/core/generic.c:250 usb_probe_device+0xd6/0x360 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x232/0x9be drivers/base/dd.c:657 __driver_probe_device+0x1d4/0x3f2 drivers/base/dd.c:799 driver_probe_device+0x60/0x1ce drivers/base/dd.c:829 __device_attach_driver+0x1e2/0x2fc drivers/base/dd.c:957 bus_for_each_drv+0x142/0x1da drivers/base/bus.c:462 __device_attach+0x1c4/0x462 drivers/base/dd.c:1029 device_initial_probe+0x1c/0x26 drivers/base/dd.c:1078 bus_probe_device+0x15c/0x192 drivers/base/bus.c:537 device_add+0x10da/0x181c drivers/base/core.c:3692 usb_new_device+0x964/0x1778 drivers/usb/core/hub.c:2663 hub_port_connect drivers/usb/core/hub.c:5535 [inline] hub_port_connect_change drivers/usb/core/hub.c:5675 [inline] port_event drivers/usb/core/hub.c:5835 [inline] hub_event+0x2716/0x48de drivers/usb/core/hub.c:5917 process_one_work+0x96a/0x1f32 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3402 kthread+0x39c/0x7d4 kernel/kthread.c:464 ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 Freed by task 925: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x5a mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x4e/0x68 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x252/0x4da mm/slub.c:4842 release_mdev+0x1e/0x28 drivers/most/most_usb.c:932 device_release+0x90/0x21c drivers/base/core.c:2568 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x238/0x4f0 lib/kobject.c:737 put_device drivers/base/core.c:3800 [inline] device_unregister+0x3c/0xe0 drivers/base/core.c:3923 most_deregister_interface+0x344/0x4be drivers/most/core.c:1402 hdm_disconnect+0xee/0x220 drivers/most/most_usb.c:1123 usb_unbind_interface+0x1b4/0x86c drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x11a/0x15c drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x3f0/0x572 drivers/base/dd.c:1295 device_release_driver+0x1e/0x28 drivers/base/dd.c:1318 bus_remove_device+0x1f4/0x3d2 drivers/base/bus.c:579 device_del+0x324/0x898 drivers/base/core.c:3881 usb_disable_device+0x2fa/0x6f8 drivers/usb/core/message.c:1418 usb_disconnect+0x28a/0x830 drivers/usb/core/hub.c:2316 hub_port_connect drivers/usb/core/hub.c:5375 [inline] hub_port_connect_change drivers/usb/core/hub.c:5675 [inline] port_event drivers/usb/core/hub.c:5835 [inline] hub_event+0x1982/0x48de drivers/usb/core/hub.c:5917 process_one_work+0x96a/0x1f32 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3402 kthread+0x39c/0x7d4 kernel/kthread.c:464 ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 The buggy address belongs to the object at ffffaf8018c1c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6304 bytes inside of freed 8192-byte region [ffffaf8018c1c000, ffffaf8018c1e000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x98c18 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xffe000000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 0ffe000000000040 ffffaf8011402280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 0ffe000000000040 ffffaf8011402280 dead000000000122 0000000000000000 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 0ffe000000000003 ffff8d8000630601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP), pid 3200, tgid 3200 (syz-executor), ts 561384557100, free_ts 560645973200 __set_page_owner+0x94/0x4a8 mm/page_owner.c:329 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xdc/0x1ba mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x880/0x3660 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x22e/0x2124 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fa/0x5ba mm/mempolicy.c:2419 alloc_frozen_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2490 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x26e/0x34c mm/slub.c:2673 ___slab_alloc+0xb64/0x1214 mm/slub.c:3859 __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x1fe/0x6ac mm/slub.c:5015 kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x11e/0x37a net/sched/sch_generic.c:867 qdisc_create_dflt+0x116/0x618 net/sched/sch_generic.c:1017 attach_one_default_qdisc net/sched/sch_generic.c:1176 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2655 [inline] attach_default_qdiscs net/sched/sch_generic.c:1194 [inline] dev_activate+0x644/0x101c net/sched/sch_generic.c:1253 __dev_open+0x4f2/0x96e net/core/dev.c:1692 __dev_change_flags+0x4f8/0x6a4 net/core/dev.c:9458 netif_change_flags+0x74/0x136 net/core/dev.c:9521 page last free pid 3200 tgid 3200 stack trace: __reset_page_owner+0x78/0x1ba mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x998/0x1580 mm/page_alloc.c:2706 free_frozen_pages+0xe/0x16 mm/page_alloc.c:2744 __free_slab+0xc6/0x17c mm/slub.c:2688 free_slab+0x38/0x1ae mm/slub.c:2711 discard_slab mm/slub.c:2717 [inline] __put_partials+0x178/0x1e6 mm/slub.c:3186 put_cpu_partial+0x17c/0x296 mm/slub.c:3261 __slab_free+0x1f6/0x34e mm/slub.c:4513 do_slab_free mm/slub.c:4595 [inline] ___cache_free+0x1a4/0x1de mm/slub.c:4701 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x76/0x168 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x158/0x1ba mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x5c/0x82 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x106/0x3e8 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ipv6_add_addr+0x4b6/0x1fe2 net/ipv6/addrconf.c:1115 addrconf_add_linklocal+0x274/0x4aa net/ipv6/addrconf.c:3310 addrconf_addr_gen+0x30c/0x350 net/ipv6/addrconf.c:3441 Memory state around the buggy address: ffffaf8018c1d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8018c1d800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffffaf8018c1d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf8018c1d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8018c1d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================