================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x620/0x6d0 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff88811789e3f8 by task syz.2.16/469 CPU: 1 PID: 469 Comm: syz.2.16 Not tainted 5.15.188-syzkaller-1081189-g6b619c45dff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0x620/0x6d0 net/xfrm/xfrm_policy.c:853 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline] xfrm_policy_inexact_insert_node+0x938/0xb50 net/xfrm/xfrm_policy.c:1041 xfrm_policy_inexact_alloc_chain+0x53a/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+0x4d1/0x830 net/xfrm/xfrm_user.c:1832 xfrm_user_rcv_msg+0x45c/0x6e0 net/xfrm/xfrm_user.c:2981 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2493 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3003 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x87c/0xa40 net/netlink/af_netlink.c:1341 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1909 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 net/socket.c:2526 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 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: 0033:0x7f1024c0bda9 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:00007f102467e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1024e24fa0 RCX: 00007f1024c0bda9 RDX: 0000000000004000 RSI: 0000000020000580 RDI: 0000000000000005 RBP: 00007f1024c8d2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1024e24fa0 R15: 00007fffed2e8478 Allocated by task 469: 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:4431 kmalloc include/linux/slab.h:621 [inline] sk_prot_alloc+0xed/0x320 net/core/sock.c:1866 sk_alloc+0x38/0x430 net/core/sock.c:1923 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 ffff88811789e000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff88811789e000, ffff88811789e400) The buggy address belongs to the page: page:ffffea00045e2600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117898 head:ffffea00045e2600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 457, ts 54505240268, free_ts 54364959718 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5795 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4949 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] inet6_rt_notify+0x287/0x470 net/ipv6/route.c:6173 fib6_add_rt2node net/ipv6/ip6_fib.c:1255 [inline] fib6_add+0x2279/0x3d10 net/ipv6/ip6_fib.c:1484 __ip6_ins_rt net/ipv6/route.c:1308 [inline] ip6_route_add+0x89/0x130 net/ipv6/route.c:3884 addrconf_add_mroute net/ipv6/addrconf.c:2531 [inline] addrconf_add_dev+0x329/0x430 net/ipv6/addrconf.c:2549 addrconf_dev_config net/ipv6/addrconf.c:3426 [inline] addrconf_init_auto_addrs+0x806/0xcd0 net/ipv6/addrconf.c:3519 addrconf_notify+0x95d/0xde0 net/ipv6/addrconf.c:3688 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391 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+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5871 __free_slab+0xe8/0x1e0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2527 put_cpu_partial+0xc6/0x120 mm/slub.c:2607 __slab_free+0x1d4/0x290 mm/slub.c:3390 do_slab_free mm/slub.c:3509 [inline] ___cache_free+0x104/0x120 mm/slub.c:3530 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:3240 [inline] slab_alloc mm/slub.c:3250 [inline] __kmalloc+0x120/0x2c0 mm/slub.c:4427 kmalloc include/linux/slab.h:621 [inline] kzalloc include/linux/slab.h:747 [inline] fib6_info_alloc+0x34/0xe0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x526/0x1510 net/ipv6/route.c:3784 Memory state around the buggy address: ffff88811789e280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811789e300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811789e380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff88811789e400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811789e480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================