================================================================== 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:3109 Read of size 8 at addr ffff888011ff5b80 by task kworker/u4:8/16727 CPU: 0 PID: 16727 Comm: kworker/u4:8 Not tainted 5.15.0-rc6-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:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] tcp_sk_exit+0x2a4/0x2e0 net/ipv4/tcp_ipv4.c:3109 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 23157: 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+0x83/0xb0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x209/0x390 mm/slub.c:3226 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1914 sk_alloc+0x30/0xa60 net/core/sock.c:1973 inet6_create net/ipv6/af_inet6.c:184 [inline] inet6_create+0x36f/0x1030 net/ipv6/af_inet6.c:111 __sock_create+0x353/0x790 net/socket.c:1464 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1652 icmpv6_sk_init net/ipv6/icmp.c:1052 [inline] icmpv6_sk_init+0xfa/0x2d0 net/ipv6/icmp.c:1042 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:326 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 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:3077 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149 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 16727: 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+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726 slab_free mm/slub.c:3492 [inline] kmem_cache_free+0x95/0x4e0 mm/slub.c:3508 sk_prot_free net/core/sock.c:1954 [inline] __sk_destruct+0x5a2/0x900 net/core/sock.c:2042 sk_destruct+0xbd/0xe0 net/core/sock.c:2057 __sk_free+0xef/0x3d0 net/core/sock.c:2068 sk_free net/core/sock.c:2079 [inline] sock_put include/net/sock.h:1885 [inline] sk_common_release+0x292/0x390 net/core/sock.c:3515 inet_release+0x12e/0x280 net/ipv4/af_inet.c:427 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:479 __sock_release net/socket.c:649 [inline] sock_release+0x87/0x1b0 net/socket.c:677 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] icmpv6_sk_exit+0x14c/0x240 net/ipv6/icmp.c:1038 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 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 ffff888011ff5700 which belongs to the cache RAWv6 of size 1696 The buggy address is located 1152 bytes inside of 1696-byte region [ffff888011ff5700, ffff888011ff5da0) The buggy address belongs to the page: page:ffffea000047fc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888011ff0000 pfn:0x11ff0 head:ffffea000047fc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000943400 0000000500000005 ffff888147670b40 raw: ffff888011ff0000 0000000080110010 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 21746, ts 489385851243, free_ts 482273289170 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x319/0x490 mm/slub.c:1970 ___slab_alloc+0x950/0x1050 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x365/0x390 mm/slub.c:3226 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1914 sk_alloc+0x30/0xa60 net/core/sock.c:1973 inet6_create net/ipv6/af_inet6.c:184 [inline] inet6_create+0x36f/0x1030 net/ipv6/af_inet6.c:111 __sock_create+0x353/0x790 net/socket.c:1464 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1652 igmp6_net_init+0x1bd/0x430 net/ipv6/mcast.c:3149 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:326 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 __unfreeze_partials+0x340/0x360 mm/slub.c:2502 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+0x95/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc_trace+0x260/0x3c0 mm/slub.c:3238 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] set_kthread_struct kernel/kthread.c:103 [inline] set_kthread_struct+0xc8/0x130 kernel/kthread.c:96 kthread+0x69/0x4d0 kernel/kthread.c:281 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888011ff5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888011ff5b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888011ff5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888011ff5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888011ff5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================