================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0x17a/0x190 drivers/base/core.c:4044 Read of size 8 at addr ffff88801be815f8 by task kbnepd bnep0/8034 CPU: 0 PID: 8034 Comm: kbnepd bnep0 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #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 5180: 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_fclone include/linux/skbuff.h:1363 [inline] tcp_stream_alloc_skb+0x34/0x570 net/ipv4/tcp.c:873 tcp_sendmsg_locked+0xed5/0x3470 net/ipv4/tcp.c:1155 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1342 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x4b8/0x5c0 net/socket.c:1160 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6db/0x1100 fs/read_write.c:590 ksys_write+0x1f8/0x260 fs/read_write.c:643 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 Freed by task 5180: 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+0x51/0x70 net/core/skbuff.c:1216 tcp_wmem_free_skb include/net/tcp.h:312 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:2098 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3375 [inline] tcp_ack+0x1eb7/0x5ba0 net/ipv4/tcp_input.c:3967 tcp_rcv_established+0xda1/0x21b0 net/ipv4/tcp_input.c:6079 tcp_v4_do_rcv+0x6a9/0xa50 net/ipv4/tcp_ipv4.c:1906 tcp_v4_rcv+0x3377/0x3b20 net/ipv4/tcp_ipv4.c:2332 ip_protocol_deliver_rcu+0xba/0x4e0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_sublist_rcv_finish+0x2c1/0x620 net/ipv4/ip_input.c:580 ip_list_rcv_finish.constprop.0+0x559/0x720 net/ipv4/ip_input.c:631 ip_sublist_rcv net/ipv4/ip_input.c:639 [inline] ip_list_rcv+0x339/0x450 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5587 [inline] __netif_receive_skb_list_core+0x755/0x950 net/core/dev.c:5635 __netif_receive_skb_list net/core/dev.c:5687 [inline] netif_receive_skb_list_internal+0x753/0xda0 net/core/dev.c:5779 gro_normal_list include/net/gro.h:438 [inline] gro_normal_list include/net/gro.h:434 [inline] napi_complete_done+0x23f/0x9a0 net/core/dev.c:6119 virtqueue_napi_complete drivers/net/virtio_net.c:515 [inline] virtnet_poll+0x1014/0x18c0 drivers/net/virtio_net.c:2227 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6638 napi_poll net/core/dev.c:6707 [inline] net_rx_action+0x9ad/0xf10 net/core/dev.c:6822 __do_softirq+0x218/0x922 kernel/softirq.c:554 The buggy address belongs to the object at ffff88801be81500 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 248 bytes inside of freed 640-byte region [ffff88801be81500, ffff88801be81780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1be80 head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888018e9ba00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff80000000840 ffff888018e9ba00 dead000000000122 0000000000000000 head: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff80000000002 ffffea00006fa001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5064, tgid 837980611 (syz-fuzzer), ts 5180, free_ts 254198790178 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_fclone include/linux/skbuff.h:1363 [inline] tcp_stream_alloc_skb+0x34/0x570 net/ipv4/tcp.c:873 tcp_sendmsg_locked+0xed5/0x3470 net/ipv4/tcp.c:1155 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1342 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x4b8/0x5c0 net/socket.c:1160 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6db/0x1100 fs/read_write.c:590 ksys_write+0x1f8/0x260 fs/read_write.c:643 page last free pid 8466 tgid 8466 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+0x10d/0x1c0 mm/swap.c:132 __folio_put+0x1c0/0x1f0 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 get_signal+0x2616/0x2710 kernel/signal.c:2911 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 Memory state around the buggy address: ffff88801be81480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801be81500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801be81580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801be81600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801be81680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================