================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5df/0x690 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff888060051600 by task syz.7.707/7545 CPU: 1 PID: 7545 Comm: syz.7.707 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 xfrm_policy_inexact_list_reinsert+0x5df/0x690 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_reinsert net/xfrm/xfrm_policy.c:962 [inline] xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:997 [inline] xfrm_policy_inexact_insert_node+0x599/0xb60 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x7cf/0xea0 net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0xe0/0x1460 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0x112/0x930 net/xfrm/xfrm_policy.c:1605 xfrm_add_policy+0x4d6/0x860 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x58d/0x860 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 xfrm_netlink_rcv+0x75/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x190/0x250 net/socket.c:2526 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fce031f69a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fce0105e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fce0341dfa0 RCX: 00007fce031f69a9 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007fce03278d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fce0341dfa0 R15: 00007ffefe838168 Allocated by task 7545: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:609 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:1864 sk_alloc+0x2f/0x310 net/core/sock.c:1917 pfkey_create+0xd8/0x560 net/key/af_key.c:152 __sock_create+0x47b/0x900 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0xe2/0x170 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3011 [inline] call_rcu+0x182/0x930 kernel/rcu/tree.c:3091 netlink_release+0x134f/0x1790 net/netlink/af_netlink.c:799 __sock_release net/socket.c:649 [inline] sock_close+0xd5/0x240 net/socket.c:1336 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 kvfree_call_rcu+0x10a/0x7c0 kernel/rcu/tree.c:3600 drop_sysctl_table+0x2fa/0x430 fs/proc/proc_sysctl.c:1685 unregister_sysctl_table+0x87/0x130 fs/proc/proc_sysctl.c:1723 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7131 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7159 [inline] addrconf_ifdown+0x15ed/0x1970 net/ipv6/addrconf.c:3929 addrconf_notify+0x445/0xf00 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] unregister_netdevice_many+0xf57/0x18f0 net/core/dev.c:11134 unregister_netdevice_queue+0x31c/0x360 net/core/dev.c:11067 unregister_netdevice include/linux/netdevice.h:3020 [inline] nsim_destroy+0x49/0x150 drivers/net/netdevsim/netdev.c:382 __nsim_dev_port_del+0x155/0x1c0 drivers/net/netdevsim/dev.c:1349 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1362 [inline] nsim_dev_reload_destroy+0x16c/0x240 drivers/net/netdevsim/dev.c:1561 nsim_dev_reload_down+0xf9/0x160 drivers/net/netdevsim/dev.c:883 devlink_reload+0x265/0x770 net/core/devlink.c:3963 devlink_pernet_pre_exit+0x19d/0x300 net/core/devlink.c:11543 ops_pre_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x57b/0xb80 net/core/net_namespace.c:615 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888060051000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff888060051000, ffff888060051800) The buggy address belongs to the page: page:ffffea0001801400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60050 head:ffffea0001801400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016842000 raw: 0000000000000000 0000000000080008 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 4185, ts 70282078826, free_ts 21042367034 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc_track_caller+0x1cb/0x330 mm/slub.c:4925 kmemdup+0x22/0x50 mm/util.c:128 neigh_sysctl_register+0x9b/0xa80 net/core/neighbour.c:3652 addrconf_sysctl_register+0xac/0x1b0 net/ipv6/addrconf.c:7145 addrconf_notify+0x7cb/0xf00 net/ipv6/addrconf.c:3706 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_change_name+0x671/0xbd0 net/core/dev.c:1332 do_setlink+0x99d/0x3980 net/core/rtnetlink.c:2759 __rtnl_newlink net/core/rtnetlink.c:3450 [inline] rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9393 destroy_args+0xef/0x8b0 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1331 do_one_initcall+0x1ee/0x680 init/main.c:1302 do_initcall_level+0x137/0x1f0 init/main.c:1375 do_initcalls+0x4b/0x90 init/main.c:1391 kernel_init_freeable+0x3ce/0x560 init/main.c:1615 kernel_init+0x19/0x1b0 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888060051500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888060051580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff888060051600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888060051680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060051700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================