================================================================== 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 ffff88810b30a3d8 by task syz.5.650/1986 CPU: 0 PID: 1986 Comm: syz.5.650 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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: 0033:0x7f8105c3ae59 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:00007f8104694028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8105ec2fa0 RCX: 00007f8105c3ae59 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f8105cd0e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8105ec3038 R14: 00007f8105ec2fa0 R15: 00007ffd0265cdb8 Allocated by task 1986: 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 ffff88810b30a000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff88810b30a000, ffff88810b30a400) The buggy address belongs to the page: page:ffffea00042cc200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b308 head:ffffea00042cc200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000400000001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1548, ts 78434044267, free_ts 78431995306 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] kmem_cache_alloc_trace+0x1a8/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] ipv6_add_dev+0xd2/0x10b0 net/ipv6/addrconf.c:381 addrconf_notify+0x582/0xea0 net/ipv6/addrconf.c:3570 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 ip6_tnl_create2+0xbf/0x330 net/ipv6/ip6_tunnel.c:290 ip6_tnl_create net/ipv6/ip6_tunnel.c:340 [inline] ip6_tnl_locate+0x61e/0x710 net/ipv6/ip6_tunnel.c:390 ip6_tnl_ioctl+0x754/0xf60 net/ipv6/ip6_tunnel.c:1686 dev_do_ioctl net/core/dev_ioctl.c:206 [inline] dev_ifsioc+0x6b4/0xa90 net/core/dev_ioctl.c:312 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x390 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x150/0x180 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965 getname_flags+0xba/0x510 fs/namei.c:141 user_path_at_empty+0x2f/0x50 fs/namei.c:2748 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x10a/0x530 fs/stat.c:193 Memory state around the buggy address: ffff88810b30a280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810b30a300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810b30a380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88810b30a400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810b30a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================