================================================================== 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:3089 Read of size 8 at addr ffff8880999c5840 by task kworker/u4:10/19355 CPU: 0 PID: 19355 Comm: kworker/u4:10 Not tainted 5.14.0-rc7-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:105 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:3089 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591 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 24660: 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:2959 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x285/0x4a0 mm/slub.c:2972 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1816 sk_alloc+0x32/0xbc0 net/core/sock.c:1875 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:1654 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:3003 __do_sys_unshare kernel/fork.c:3077 [inline] __se_sys_unshare kernel/fork.c:3075 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3075 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 19355: 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:1628 [inline] slab_free_freelist_hook+0xe3/0x250 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kmem_cache_free+0x8a/0x5b0 mm/slub.c:3229 sk_prot_free net/core/sock.c:1856 [inline] __sk_destruct+0x5a2/0x900 net/core/sock.c:1943 sk_destruct+0xbd/0xe0 net/core/sock.c:1958 __sk_free+0xef/0x3d0 net/core/sock.c:1969 sk_free net/core/sock.c:1980 [inline] sock_put include/net/sock.h:1815 [inline] sk_common_release+0x292/0x390 net/core/sock.c:3420 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 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:591 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 ffff8880999c5400 which belongs to the cache RAWv6 of size 1632 The buggy address is located 1088 bytes inside of 1632-byte region [ffff8880999c5400, ffff8880999c5a60) The buggy address belongs to the page: page:ffffea0002667000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x999c0 head:ffffea0002667000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000c61600 0000000200000002 ffff88814812cb40 raw: 0000000000000000 0000000000120012 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 10257, ts 1618551161072, free_ts 1618443793698 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4168 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x473/0x7b0 mm/slub.c:2803 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843 slab_alloc_node mm/slub.c:2925 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x3e1/0x4a0 mm/slub.c:2972 sk_prot_alloc+0x5f/0x290 net/core/sock.c:1816 sk_alloc+0x32/0xbc0 net/core/sock.c:1875 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:1654 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 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:2959 [inline] kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:2995 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1116 [inline] __ip6_append_data.isra.0+0x2c53/0x3bb0 net/ipv6/ip6_output.c:1635 ip6_append_data+0x207/0x350 net/ipv6/ip6_output.c:1803 rawv6_sendmsg+0x14f2/0x3a20 net/ipv6/raw.c:949 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2406 ___sys_sendmsg+0xf3/0x170 net/socket.c:2460 __sys_sendmmsg+0x195/0x470 net/socket.c:2546 __do_sys_sendmmsg net/socket.c:2575 [inline] __se_sys_sendmmsg net/socket.c:2572 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2572 Memory state around the buggy address: ffff8880999c5700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880999c5780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880999c5800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880999c5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880999c5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================