================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x518/0x568 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff0000e8a84600 by task syz.8.1019/7882 CPU: 0 PID: 7882 Comm: syz.8.1019 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x518/0x568 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x77c/0x924 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x580/0x107c net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0xe0/0x1088 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0xd4/0x874 net/xfrm/xfrm_policy.c:1602 xfrm_add_policy+0x428/0x830 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x4ac/0x730 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2489 xfrm_netlink_rcv+0x84/0xa0 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x584/0x870 net/socket.c:2436 ___sys_sendmsg+0x214/0x294 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2526 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 7882: 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+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x29c/0x4c8 mm/slub.c:4407 kmalloc include/linux/slab.h:609 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:1866 sk_alloc+0x40/0x3dc net/core/sock.c:1919 pfkey_create+0xcc/0x544 net/key/af_key.c:152 __sock_create+0x43c/0x8a0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0x168/0x310 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1591 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 kvfree_call_rcu+0xb8/0x684 kernel/rcu/tree.c:3596 drop_sysctl_table+0x274/0x3a0 fs/proc/proc_sysctl.c:1681 unregister_sysctl_table+0x94/0x130 fs/proc/proc_sysctl.c:1719 unregister_net_sysctl_table+0x20/0x30 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7133 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7161 [inline] addrconf_ifdown+0x14a0/0x1834 net/ipv6/addrconf.c:3931 addrconf_notify+0x36c/0xc78 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] unregister_netdevice_many+0xec8/0x18a8 net/core/dev.c:11133 sit_exit_batch_net+0x428/0x478 net/ipv6/sit.c:1952 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x6bc/0xa9c net/core/net_namespace.c:618 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000e8a84000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff0000e8a84000, ffff0000e8a84800) The buggy address belongs to the page: page:00000000f6742d2b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x128a80 head:00000000f6742d2b order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 0000000100000001 ffff0000c0002900 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e8a84500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000e8a84580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff0000e8a84600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000e8a84680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e8a84700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================