================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5a3/0x650 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff888062123608 by task syz.0.32/4399 CPU: 0 PID: 4399 Comm: syz.0.32 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x250 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+0x5a3/0x650 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x95f/0xb70 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x7a2/0xe70 net/xfrm/xfrm_policy.c:1169 xfrm_policy_inexact_insert+0xd7/0x12d0 net/xfrm/xfrm_policy.c:1212 xfrm_policy_insert+0x10f/0x940 net/xfrm/xfrm_policy.c:1596 xfrm_add_policy+0x4e6/0x870 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x694/0x980 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512 xfrm_netlink_rcv+0x75/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmsg net/socket.c:2529 [inline] __do_sys_sendmsg net/socket.c:2538 [inline] __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536 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: 0033:0x7f85292f5e59 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:00007f852754f028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f852956efa0 RCX: 00007f85292f5e59 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f852938be6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f852956f038 R14: 00007f852956efa0 R15: 00007ffec439d2e8 Allocated by task 4399: 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+0xaf/0xe0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:612 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:1866 sk_alloc+0x2f/0x310 net/core/sock.c:1922 pfkey_create+0xd8/0x560 net/key/af_key.c:152 __sock_create+0x473/0x910 net/socket.c:1496 sock_create net/socket.c:1552 [inline] __sys_socket+0xe2/0x170 net/socket.c:1594 __do_sys_socket net/socket.c:1603 [inline] __se_sys_socket net/socket.c:1601 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1601 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 The buggy address belongs to the object at ffff888062123000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1544 bytes inside of 2048-byte region [ffff888062123000, ffff888062123800) The buggy address belongs to the page: page:ffffea0001884800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62120 head:ffffea0001884800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001882000 0000000300000003 ffff888016c42000 raw: 0000000000000000 0000000080080008 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 4192, ts 64049427389, free_ts 23701351490 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] ipv6_add_dev+0xce/0x11a0 net/ipv6/addrconf.c:384 addrconf_notify+0x66f/0xf20 net/ipv6/addrconf.c:3579 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:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] register_netdevice+0x12a8/0x1720 net/core/dev.c:10454 virt_wifi_newlink+0x3b0/0x7e0 drivers/net/wireless/virt_wifi.c:566 __rtnl_newlink net/core/rtnetlink.c:3530 [inline] rtnl_newlink+0x139e/0x1920 net/core/rtnetlink.c:3578 rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2073 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+0x8f/0x2a0 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9428 destroy_args+0xef/0xa00 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x272/0x730 init/main.c:1315 do_initcall_level+0x13d/0x1f0 init/main.c:1388 do_initcalls+0x4b/0x90 init/main.c:1404 kernel_init_freeable+0x3d5/0x560 init/main.c:1628 kernel_init+0x19/0x1b0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888062123500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888062123580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc >ffff888062123600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888062123680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888062123700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================