================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x606/0x6c0 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff888118e283f8 by task syz.1.3574/11202 CPU: 0 PID: 11202 Comm: syz.1.3574 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x606/0x6c0 net/xfrm/xfrm_policy.c:853 xfrm_policy_inexact_node_reinsert net/xfrm/xfrm_policy.c:941 [inline] xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:976 [inline] xfrm_policy_inexact_insert_node+0x5a7/0xb50 net/xfrm/xfrm_policy.c:1041 xfrm_policy_inexact_alloc_chain+0x53d/0xb30 net/xfrm/xfrm_policy.c:1157 xfrm_policy_inexact_insert+0x70/0x1130 net/xfrm/xfrm_policy.c:1200 xfrm_policy_insert+0x126/0x9a0 net/xfrm/xfrm_policy.c:1586 xfrm_add_policy+0x4ed/0x850 net/xfrm/xfrm_user.c:1832 xfrm_user_rcv_msg+0x4dc/0x7b0 net/xfrm/xfrm_user.c:2981 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3003 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 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] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7fa0e6ec4eb9 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:00007fa0e5921028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa0e713ffa0 RCX: 00007fa0e6ec4eb9 RDX: 0000000000004000 RSI: 0000200000000440 RDI: 0000000000000006 RBP: 00007fa0e6f32c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa0e7140038 R14: 00007fa0e713ffa0 R15: 00007ffd98b5a208 Allocated by task 11202: 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:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] sk_prot_alloc+0xed/0x320 net/core/sock.c:1868 sk_alloc+0x38/0x430 net/core/sock.c:1928 pfkey_create+0x12a/0x660 net/key/af_key.c:152 __sock_create+0x38d/0x7a0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0xec/0x190 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1591 x64_sys_call+0x8c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:42 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 ffff888118e28000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff888118e28000, ffff888118e28400) The buggy address belongs to the page: page:ffffea0004638a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118e28 head:ffffea0004638a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea00045a8800 0000000600000006 ffff888100043080 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5715, ts 263748603010, free_ts 263618137754 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x21a/0x740 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_fib+0x60a/0xe20 net/ipv4/fib_semantics.c:520 fib_table_insert+0xbe4/0x1ea0 net/ipv4/fib_trie.c:1379 fib_magic net/ipv4/fib_frontend.c:1107 [inline] fib_add_ifaddr+0xb4d/0xf10 net/ipv4/fib_frontend.c:1151 fib_netdev_event+0x231/0x5d0 net/ipv4/fib_frontend.c:1489 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2057 [inline] call_netdevice_notifiers_extack net/core/dev.c:2069 [inline] call_netdevice_notifiers net/core/dev.c:2083 [inline] __dev_notify_flags+0x2c1/0x560 net/core/dev.c:8899 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8937 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5884 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0xfb/0x270 mm/slub.c:3272 kmem_cache_alloc_node_trace include/linux/slab.h:508 [inline] kmalloc_node include/linux/slab.h:637 [inline] kzalloc_node include/linux/slab.h:761 [inline] __get_vm_area_node+0x11d/0x350 mm/vmalloc.c:2440 __vmalloc_node_range+0xdf/0xaf0 mm/vmalloc.c:3107 Memory state around the buggy address: ffff888118e28280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888118e28300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888118e28380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff888118e28400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888118e28480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================