================================================================== BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] BUG: KASAN: use-after-free in tcp_sk_exit+0x2a4/0x2e0 net/ipv4/tcp_ipv4.c:2868 Read of size 8 at addr ffff888070b30a78 by task kworker/u4:6/8407 CPU: 0 PID: 8407 Comm: kworker/u4:6 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] tcp_sk_exit+0x2a4/0x2e0 net/ipv4/tcp_ipv4.c:2868 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:175 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 13934: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2970 [inline] slab_alloc mm/slub.c:2978 [inline] kmem_cache_alloc+0x29b/0x4a0 mm/slub.c:2983 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1741 sk_alloc+0x32/0xbd0 net/core/sock.c:1800 inet_create net/ipv4/af_inet.c:322 [inline] inet_create+0x3ae/0xe90 net/ipv4/af_inet.c:248 __sock_create+0x3de/0x780 net/socket.c:1443 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1654 tcp_sk_init net/ipv4/tcp_ipv4.c:2883 [inline] tcp_sk_init+0x102/0x1370 net/ipv4/tcp_ipv4.c:2872 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:474 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3002 __do_sys_unshare kernel/fork.c:3076 [inline] __se_sys_unshare kernel/fork.c:3074 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3074 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+0x44/0xae Freed by task 8407: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1639 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1664 slab_free mm/slub.c:3224 [inline] kmem_cache_free+0x8e/0x5a0 mm/slub.c:3240 sk_prot_free net/core/sock.c:1781 [inline] __sk_destruct+0x57f/0x900 net/core/sock.c:1868 sk_destruct+0xbd/0xe0 net/core/sock.c:1883 __sk_free+0xef/0x3d0 net/core/sock.c:1894 sk_free net/core/sock.c:1905 [inline] sock_put include/net/sock.h:1813 [inline] sk_common_release+0x29c/0x390 net/core/sock.c:3338 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 __sock_release net/socket.c:647 [inline] sock_release+0x87/0x1b0 net/socket.c:675 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] tcp_sk_exit+0x1c7/0x2e0 net/ipv4/tcp_ipv4.c:2868 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:175 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888070b30640 which belongs to the cache RAW of size 1424 The buggy address is located 1080 bytes inside of 1424-byte region [ffff888070b30640, ffff888070b30bd0) The buggy address belongs to the page: page:ffffea0001c2cc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70b30 head:ffffea0001c2cc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000813600 0000000600000006 ffff888144211500 raw: 0000000000000000 0000000000140014 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12412, ts 252702678448, free_ts 252653800716 prep_new_page mm/page_alloc.c:2445 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4178 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1702 [inline] allocate_slab+0x32b/0x4c0 mm/slub.c:1842 new_slab mm/slub.c:1905 [inline] new_slab_objects mm/slub.c:2651 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2814 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2854 slab_alloc_node mm/slub.c:2936 [inline] slab_alloc mm/slub.c:2978 [inline] kmem_cache_alloc+0x3cd/0x4a0 mm/slub.c:2983 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1741 sk_alloc+0x32/0xbd0 net/core/sock.c:1800 inet_create net/ipv4/af_inet.c:322 [inline] inet_create+0x3ae/0xe90 net/ipv4/af_inet.c:248 __sock_create+0x3de/0x780 net/socket.c:1443 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1654 icmp_sk_init net/ipv4/icmp.c:1460 [inline] icmp_sk_init+0xfd/0x500 net/ipv4/icmp.c:1449 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:474 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1355 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3341 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3420 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2432 put_cpu_partial+0x13d/0x230 mm/slub.c:2468 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2970 [inline] slab_alloc mm/slub.c:2978 [inline] kmem_cache_alloc_trace+0x283/0x3c0 mm/slub.c:2995 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] kset_create lib/kobject.c:969 [inline] kset_create_and_add+0x4b/0x190 lib/kobject.c:1012 register_queue_kobjects net/core/net-sysfs.c:1703 [inline] netdev_register_kobject+0x1c6/0x430 net/core/net-sysfs.c:1959 register_netdevice+0xd33/0x1500 net/core/dev.c:10315 __ip_tunnel_create+0x398/0x5c0 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x330/0x9c0 net/ipv4/ip_tunnel.c:1060 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:474 Memory state around the buggy address: ffff888070b30900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888070b30980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888070b30a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888070b30a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888070b30b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================