================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110 lib/list_debug.c:59 Read of size 8 at addr ffff88807bf928c8 by task syz-executor.4/3638 CPU: 1 PID: 3638 Comm: syz-executor.4 Not tainted 6.0.0-rc3-next-20220901-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __list_del_entry_valid+0xf2/0x110 lib/list_debug.c:59 __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] klist_release+0x66/0x480 lib/klist.c:189 kref_put include/linux/kref.h:65 [inline] klist_dec_and_del lib/klist.c:206 [inline] klist_put+0x151/0x1d0 lib/klist.c:217 device_del+0x46d/0xc80 drivers/base/core.c:3699 hci_conn_del_sysfs+0xdc/0x180 net/bluetooth/hci_sysfs.c:78 hci_conn_cleanup+0x315/0x7b0 net/bluetooth/hci_conn.c:152 hci_conn_del+0x29b/0x790 net/bluetooth/hci_conn.c:1086 hci_conn_hash_flush+0x197/0x260 net/bluetooth/hci_conn.c:2431 hci_dev_close_sync+0x5c4/0x1200 net/bluetooth/hci_sync.c:4737 hci_dev_do_close+0x2d/0x70 net/bluetooth/hci_core.c:554 hci_unregister_dev+0x17f/0x4e0 net/bluetooth/hci_core.c:2682 vhci_release+0x7c/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16b/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xc3f/0x2b60 kernel/exit.c:818 do_group_exit+0xd0/0x2a0 kernel/exit.c:948 __do_sys_exit_group kernel/exit.c:959 [inline] __se_sys_exit_group kernel/exit.c:957 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:957 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4e5fa89409 Code: Unable to access opcode bytes at RIP 0x7f4e5fa893df. RSP: 002b:00007fff6d033438 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fff6d0335e0 RCX: 00007f4e5fa89409 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 RBP: 0000000000000000 R08: 0000000000000025 R09: 00007fff6d0335e0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4e5fae4338 R13: 000000000000001c R14: 0000000000000011 R15: 00007fff6d033620 Allocated by task 12601: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] __do_kmalloc_node mm/slab_common.c:930 [inline] __kmalloc_node_track_caller+0x55/0xc0 mm/slab_common.c:950 kmalloc_reserve net/core/skbuff.c:358 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:430 alloc_skb include/linux/skbuff.h:1258 [inline] nlmsg_new include/net/netlink.h:955 [inline] inet_netconf_notify_devconf+0xdd/0x260 net/ipv4/devinet.c:2101 __devinet_sysctl_register+0x1c5/0x280 net/ipv4/devinet.c:2592 devinet_sysctl_register net/ipv4/devinet.c:2626 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2616 inetdev_init+0x286/0x580 net/ipv4/devinet.c:279 inetdev_event+0xa85/0x1610 net/ipv4/devinet.c:1534 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] register_netdevice+0x1127/0x1680 net/core/dev.c:10103 __ip_tunnel_create+0x398/0x570 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2e8/0x9f0 net/ipv4/ip_tunnel.c:1073 ops_init+0xaf/0x470 net/core/net_namespace.c:135 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:227 ksys_unshare+0x445/0x920 kernel/fork.c:3195 __do_sys_unshare kernel/fork.c:3266 [inline] __se_sys_unshare kernel/fork.c:3264 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3264 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 12601: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1651 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1677 slab_free mm/slub.c:3580 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3593 skb_free_head+0xac/0x110 net/core/skbuff.c:658 skb_release_data+0x5f1/0x870 net/core/skbuff.c:687 skb_release_all net/core/skbuff.c:752 [inline] __kfree_skb net/core/skbuff.c:766 [inline] consume_skb net/core/skbuff.c:931 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:925 netlink_broadcast+0x35c/0xd90 net/netlink/af_netlink.c:1518 nlmsg_multicast include/net/netlink.h:1035 [inline] nlmsg_notify+0x8f/0x280 net/netlink/af_netlink.c:2581 inet_netconf_notify_devconf+0x13a/0x260 net/ipv4/devinet.c:2113 __devinet_sysctl_register+0x1c5/0x280 net/ipv4/devinet.c:2592 devinet_sysctl_register net/ipv4/devinet.c:2626 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2616 inetdev_init+0x286/0x580 net/ipv4/devinet.c:279 inetdev_event+0xa85/0x1610 net/ipv4/devinet.c:1534 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] register_netdevice+0x1127/0x1680 net/core/dev.c:10103 __ip_tunnel_create+0x398/0x570 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2e8/0x9f0 net/ipv4/ip_tunnel.c:1073 ops_init+0xaf/0x470 net/core/net_namespace.c:135 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:227 ksys_unshare+0x445/0x920 kernel/fork.c:3195 __do_sys_unshare kernel/fork.c:3266 [inline] __se_sys_unshare kernel/fork.c:3264 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3264 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x8f0 kernel/rcu/tree.c:3341 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1716 unregister_sysctl_table fs/proc/proc_sysctl.c:1754 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1729 neigh_sysctl_unregister+0x5b/0x80 net/core/neighbour.c:3871 devinet_sysctl_unregister net/ipv4/devinet.c:2638 [inline] inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0xcfc/0x1610 net/ipv4/devinet.c:1602 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] unregister_netdevice_many+0xa62/0x1980 net/core/dev.c:10860 vti6_exit_batch_net+0x3a0/0x670 net/ipv6/ip6_vti.c:1190 ops_exit_list+0x125/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88807bf92800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 200 bytes inside of 512-byte region [ffff88807bf92800, ffff88807bf92a00) The buggy address belongs to the physical page: page:ffffea0001efe400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bf90 head:ffffea0001efe400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011841c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 15, tgid 15 (ksoftirqd/0), ts 135998575343, free_ts 117413358995 prep_new_page mm/page_alloc.c:2534 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4284 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5542 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1721 [inline] allocate_slab+0x228/0x370 mm/slub.c:1866 new_slab mm/slub.c:1919 [inline] ___slab_alloc+0xad0/0x1440 mm/slub.c:3100 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3198 slab_alloc_node mm/slub.c:3283 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3356 __do_kmalloc_node mm/slab_common.c:929 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:950 kmalloc_reserve net/core/skbuff.c:358 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:430 __napi_alloc_skb+0x93/0x340 net/core/skbuff.c:571 napi_alloc_skb include/linux/skbuff.h:3187 [inline] page_to_skb+0x17d/0xc10 drivers/net/virtio_net.c:496 receive_mergeable drivers/net/virtio_net.c:1119 [inline] receive_buf+0xe0a/0x5560 drivers/net/virtio_net.c:1258 virtnet_receive drivers/net/virtio_net.c:1553 [inline] virtnet_poll+0x708/0x1310 drivers/net/virtio_net.c:1671 __napi_poll+0xb3/0x6d0 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x9c1/0xd90 net/core/dev.c:6689 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1451 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1501 free_unref_page_prepare mm/page_alloc.c:3382 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3478 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2514 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3317 [inline] kmem_cache_alloc_node+0x2ff/0x400 mm/slub.c:3362 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:418 alloc_skb_fclone include/linux/skbuff.h:1308 [inline] tcp_stream_alloc_skb+0x38/0x580 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xc36/0x2f80 net/ipv4/tcp.c:1325 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1483 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_write_iter+0x291/0x3d0 net/socket.c:1108 call_write_iter include/linux/fs.h:2188 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x1e8/0x250 fs/read_write.c:631 Memory state around the buggy address: ffff88807bf92780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807bf92800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807bf92880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807bf92900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bf92980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================