IPv6: NLM_F_REPLACE set, but no existing node found! ================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_insert_inexact_list net/xfrm/xfrm_policy.c:1496 [inline] BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_insert+0xc11/0xda0 net/xfrm/xfrm_policy.c:1202 Read of size 8 at addr ffff8880a7781128 by task syz-executor5/25202 CPU: 0 PID: 25202 Comm: syz-executor5 Not tainted 4.20.0+ #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 xfrm_policy_insert_inexact_list net/xfrm/xfrm_policy.c:1496 [inline] xfrm_policy_inexact_insert+0xc11/0xda0 net/xfrm/xfrm_policy.c:1202 xfrm_policy_insert+0x623/0x910 net/xfrm/xfrm_policy.c:1570 xfrm_add_policy+0x2a1/0x6c0 net/xfrm/xfrm_user.c:1657 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2477 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fccd3702c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000005 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fccd37036d4 R13: 00000000004c5394 R14: 00000000004d8e30 R15: 00000000ffffffff Allocated by task 25001: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15d/0x750 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] kzalloc include/linux/slab.h:741 [inline] __register_sysctl_table+0xc7/0xff0 fs/proc/proc_sysctl.c:1306 register_net_sysctl+0x29/0x30 net/sysctl_net.c:120 neigh_sysctl_register+0x3a5/0x730 net/core/neighbour.c:3659 addrconf_sysctl_register+0xbb/0x1e0 net/ipv6/addrconf.c:6790 ipv6_add_dev net/ipv6/addrconf.c:446 [inline] ipv6_add_dev+0xb34/0x12c0 net/ipv6/addrconf.c:366 addrconf_notify+0xa12/0x25f0 net/ipv6/addrconf.c:3452 notifier_call_chain+0x179/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] register_netdevice+0xae0/0x10b0 net/core/dev.c:8658 __ip_tunnel_create+0x36b/0x530 net/ipv4/ip_tunnel.c:282 ip_tunnel_init_net+0x3ed/0xac0 net/ipv4/ip_tunnel.c:1029 erspan_init_net+0x2a/0x30 net/ipv4/ip_gre.c:1652 ops_init+0x109/0x5d0 net/core/net_namespace.c:129 setup_net+0x326/0x8c0 net/core/net_namespace.c:314 copy_net_ns+0x2ae/0x4b0 net/core/net_namespace.c:437 create_new_namespaces+0x4ce/0x930 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x6d7/0xfb0 kernel/fork.c:2544 __do_sys_unshare kernel/fork.c:2612 [inline] __se_sys_unshare kernel/fork.c:2610 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2610 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 17697: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 __sock_kfree_s net/core/sock.c:2013 [inline] sock_kfree_s+0x29/0x70 net/core/sock.c:2019 af_alg_free_resources+0x71/0x90 crypto/af_alg.c:1033 _aead_recvmsg crypto/algif_aead.c:321 [inline] aead_recvmsg+0x979/0x1b40 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg net/socket.c:801 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:797 sock_read_iter+0x3ba/0x5a0 net/socket.c:878 call_read_iter include/linux/fs.h:1851 [inline] do_iter_readv_writev+0x6f4/0xae0 fs/read_write.c:678 do_iter_read+0x268/0x650 fs/read_write.c:922 vfs_readv+0x175/0x1c0 fs/read_write.c:986 do_readv+0x11a/0x300 fs/read_write.c:1019 __do_sys_readv fs/read_write.c:1106 [inline] __se_sys_readv fs/read_write.c:1103 [inline] __x64_sys_readv+0x75/0xb0 fs/read_write.c:1103 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7780d80 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 936 bytes inside of 1024-byte region [ffff8880a7780d80, ffff8880a7781180) The buggy address belongs to the page: page:ffffea00029de000 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001aefd88 ffffea0002a1f988 ffff88812c3f0ac0 raw: 0000000000000000 ffff8880a7780000 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7781000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7781080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a7781100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a7781180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7781200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================