================================================================== BUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline] BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567 CPU: 0 PID: 3692 Comm: kworker/0:6 Not tainted 6.0.0-rc7-syzkaller-02111-g450a580fc4b5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: events mptcp_worker 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_invalid_free+0x81/0x190 mm/kasan/report.c:462 ____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 tcp_disconnect+0x90e/0x1da0 net/ipv4/tcp.c:3143 __mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327 mptcp_do_fastclose net/mptcp/protocol.c:2592 [inline] mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627 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 Allocated by task 6809: 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 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] kobject_get_path+0xbe/0x230 lib/kobject.c:147 kobject_uevent_env+0x254/0x1640 lib/kobject_uevent.c:529 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline] net_rx_queue_update_kobjects+0xe9/0x510 net/core/net-sysfs.c:1114 register_queue_kobjects net/core/net-sysfs.c:1774 [inline] netdev_register_kobject+0x275/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xe01/0x1680 net/core/dev.c:10053 __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:134 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3181 __do_sys_unshare kernel/fork.c:3252 [inline] __se_sys_unshare kernel/fork.c:3250 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250 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+0x74/0x940 kernel/rcu/tree.c:3322 sctp_bind_addr_clean+0x135/0x1f0 net/sctp/bind_addr.c:125 sctp_association_free+0x28c/0x7d0 net/sctp/associola.c:358 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1328 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x385c/0x4ec0 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x386/0x6c0 net/sctp/associola.c:1053 sctp_inq_push+0x1d2/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0x5a0 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2906 release_sock+0x54/0x1b0 net/core/sock.c:3462 sctp_wait_for_connect+0x416/0x5c0 net/sctp/socket.c:9310 __sctp_connect+0x9a1/0xc30 net/sctp/socket.c:1245 sctp_connect net/sctp/socket.c:4805 [inline] sctp_inet_connect+0x15d/0x200 net/sctp/socket.c:4820 __sys_connect_file+0x14f/0x190 net/socket.c:1976 __sys_connect+0x161/0x190 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2000 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 The buggy address belongs to the object at ffff8880556ed680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880556ed680, ffff8880556ed6c0) The buggy address belongs to the physical page: page:ffffea000155bb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880556ed980 pfn:0x556ed flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000061a0c8 ffffea00007991c8 ffff888011841640 raw: ffff8880556ed980 000000000020000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4046, tgid 4036 (syz-executor.1), ts 74474039701, free_ts 74474016237 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1829 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x7f1/0xe10 mm/slub.c:3036 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123 slab_alloc_node mm/slub.c:3214 [inline] kmem_cache_alloc_node_trace+0x185/0x410 mm/slub.c:3312 kmalloc_node include/linux/slab.h:618 [inline] kzalloc_node include/linux/slab.h:744 [inline] __get_vm_area_node+0xed/0x3f0 mm/vmalloc.c:2477 __vmalloc_node_range+0x250/0x13a0 mm/vmalloc.c:3156 __vmalloc_node mm/vmalloc.c:3261 [inline] vmalloc+0x67/0x80 mm/vmalloc.c:3294 netlink_alloc_large_skb net/netlink/af_netlink.c:1196 [inline] netlink_sendmsg+0x690/0xe10 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_no_sendpage+0x108/0x150 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xdf/0x140 net/socket.c:1054 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:361 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __folio_put_small mm/swap.c:105 [inline] __folio_put+0xc1/0x130 mm/swap.c:128 folio_put include/linux/mm.h:1125 [inline] put_page include/linux/mm.h:1177 [inline] generic_pipe_buf_release+0x239/0x2a0 fs/pipe.c:210 pipe_buf_release include/linux/pipe_fs_i.h:183 [inline] splice_from_pipe_feed fs/splice.c:428 [inline] __splice_from_pipe+0x574/0x8a0 fs/splice.c:559 splice_from_pipe fs/splice.c:594 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:931 splice_direct_to_actor+0x331/0x8a0 fs/splice.c:886 do_splice_direct+0x1a7/0x270 fs/splice.c:974 do_sendfile+0xb19/0x1270 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1303 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 Memory state around the buggy address: ffff8880556ed580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880556ed600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880556ed680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880556ed700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880556ed780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc 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