================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x62b/0x6e0 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff888126ad6bd8 by task syz.1.1059/4249 CPU: 1 PID: 4249 Comm: syz.1.1059 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x62b/0x6e0 net/xfrm/xfrm_policy.c:853 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline] xfrm_policy_inexact_insert_node+0x954/0xb60 net/xfrm/xfrm_policy.c:1041 xfrm_policy_inexact_alloc_chain+0x540/0xb40 net/xfrm/xfrm_policy.c:1148 xfrm_policy_inexact_insert+0x6a/0x1190 net/xfrm/xfrm_policy.c:1191 xfrm_policy_insert+0x12c/0x9c0 net/xfrm/xfrm_policy.c:1577 xfrm_add_policy+0x4e1/0x840 net/xfrm/xfrm_user.c:1733 xfrm_user_rcv_msg+0x54d/0x7e0 net/xfrm/xfrm_user.c:2789 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:2811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f4ef9f1ce99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4ef8976028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4efa1a4fa0 RCX: 00007f4ef9f1ce99 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 000000000000000f RBP: 00007f4ef9fb2eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4efa1a5038 R14: 00007f4efa1a4fa0 R15: 00007ffd4f9afa88 Allocated by task 4281: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x19f/0x330 mm/slub.c:4038 kmalloc include/linux/slab.h:560 [inline] sk_prot_alloc+0xb2/0x340 net/core/sock.c:1718 sk_alloc+0x38/0x4e0 net/core/sock.c:1779 pfkey_create+0x12a/0x650 net/key/af_key.c:154 __sock_create+0x38d/0x770 net/socket.c:1437 sock_create net/socket.c:1488 [inline] __sys_socket+0xec/0x190 net/socket.c:1530 __do_sys_socket net/socket.c:1539 [inline] __se_sys_socket net/socket.c:1537 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1537 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888126ad6800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff888126ad6800, ffff888126ad6c00) The buggy address belongs to the page: page:ffffea00049ab400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x126ad0 head:ffffea00049ab400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 281, ts 23705406771, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc+0x1f9/0x330 mm/slub.c:4034 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] __register_sysctl_table+0xeb/0x1240 fs/proc/proc_sysctl.c:1323 register_net_sysctl+0x2c/0x40 net/sysctl_net.c:121 neigh_sysctl_register+0x9a9/0xa90 net/core/neighbour.c:3713 devinet_sysctl_register+0xaf/0x1e0 net/ipv4/devinet.c:2635 inetdev_init+0x26c/0x490 net/ipv4/devinet.c:277 inetdev_event+0x1f4/0x1010 net/ipv4/devinet.c:1544 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2052 [inline] call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2078 register_netdevice+0x100a/0x13a0 net/core/dev.c:10098 page_owner free stack trace missing Memory state around the buggy address: ffff888126ad6a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888126ad6b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888126ad6b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888126ad6c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888126ad6c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================