================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0x17a/0x190 drivers/base/core.c:4044 Read of size 8 at addr ffff8880693cd5f8 by task kbnepd bnep0/6891 CPU: 0 PID: 6891 Comm: kbnepd bnep0 Not tainted 6.9.0-rc6-syzkaller-00046-g18daea77cca6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 device_for_each_child+0x17a/0x190 drivers/base/core.c:4044 pm_runtime_set_memalloc_noio+0xf2/0x180 drivers/base/power/runtime.c:248 netdev_unregister_kobject+0x1ed/0x270 net/core/net-sysfs.c:2106 unregister_netdevice_many_notify+0xc8a/0x19f0 net/core/dev.c:11135 unregister_netdevice_many net/core/dev.c:11163 [inline] unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11042 unregister_netdevice include/linux/netdevice.h:3115 [inline] unregister_netdev+0x1c/0x30 net/core/dev.c:11181 bnep_session+0x220d/0x2d60 net/bluetooth/bnep/core.c:525 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6054: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc_node+0x177/0x340 mm/slub.c:3888 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:577 __alloc_skb+0x164/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1313 [inline] nlmsg_new include/net/netlink.h:1010 [inline] inet6_ifa_notify net/ipv6/addrconf.c:5604 [inline] __ipv6_ifa_notify+0x1fb/0xe20 net/ipv6/addrconf.c:6253 addrconf_ifdown.isra.0+0xef6/0x1b40 net/ipv6/addrconf.c:3978 addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3777 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1543 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11080 unregister_netdevice_many net/core/dev.c:11163 [inline] default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11640 ops_exit_list+0x128/0x180 net/core/net_namespace.c:175 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:637 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3348 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 6054: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x380 mm/slub.c:4344 skb_kfree_head net/core/skbuff.c:1094 [inline] skb_kfree_head net/core/skbuff.c:1091 [inline] skb_free_head+0x19a/0x1e0 net/core/skbuff.c:1108 skb_release_data+0x76c/0x990 net/core/skbuff.c:1136 skb_release_all net/core/skbuff.c:1202 [inline] __kfree_skb net/core/skbuff.c:1216 [inline] consume_skb net/core/skbuff.c:1432 [inline] consume_skb+0xd2/0x170 net/core/skbuff.c:1426 netlink_broadcast_filtered+0x3d5/0xf10 net/netlink/af_netlink.c:1546 nlmsg_multicast_filtered include/net/netlink.h:1111 [inline] nlmsg_multicast include/net/netlink.h:1130 [inline] nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2602 inet6_ifa_notify net/ipv6/addrconf.c:5615 [inline] __ipv6_ifa_notify+0x26b/0xe20 net/ipv6/addrconf.c:6253 addrconf_ifdown.isra.0+0xef6/0x1b40 net/ipv6/addrconf.c:3978 addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3777 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1543 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11080 unregister_netdevice_many net/core/dev.c:11163 [inline] default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11640 ops_exit_list+0x128/0x180 net/core/net_namespace.c:175 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:637 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3348 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8880693cd500 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 248 bytes inside of freed 640-byte region [ffff8880693cd500, ffff8880693cd780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x693cc head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888018e9d280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff00000000840 ffff888018e9d280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff00000000002 ffffea0001a4f301 dead000000000122 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6054, tgid 420221999 (kworker/u8:11), ts 6054, free_ts 309649990629 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc_node+0x10a/0x340 mm/slub.c:3888 kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:577 __alloc_skb+0x164/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1313 [inline] nlmsg_new include/net/netlink.h:1010 [inline] inet6_ifa_notify net/ipv6/addrconf.c:5604 [inline] __ipv6_ifa_notify+0x1fb/0xe20 net/ipv6/addrconf.c:6253 addrconf_ifdown.isra.0+0xef6/0x1b40 net/ipv6/addrconf.c:3978 addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3777 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1543 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11080 page last free pid 6805 tgid 6805 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 __folio_put_large mm/swap.c:132 [inline] __folio_put+0x210/0x290 mm/swap.c:140 hci_release_dev+0x525/0x660 net/bluetooth/hci_core.c:2833 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94 device_release+0xa1/0x240 drivers/base/core.c:2580 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fa/0x5b0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3828 vhci_release+0x87/0x100 drivers/bluetooth/hci_vhci.c:675 __fput+0x270/0xb80 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2c10 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880693cd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880693cd500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880693cd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880693cd600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880693cd680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================