================================================================== 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 ffff8881187cdbd8 by task syz.9.629/2805 CPU: 1 PID: 2805 Comm: syz.9.629 Not tainted 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: 0033:0x7fe876b40e59 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:00007fe87559a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe876dc8fa0 RCX: 00007fe876b40e59 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007fe876bd6e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe876dc9038 R14: 00007fe876dc8fa0 R15: 00007ffedd44e8c8 Allocated by task 2805: 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0x117/0x670 kernel/rcu/tree.c:3539 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1684 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1722 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:127 neigh_sysctl_unregister+0x78/0x90 net/core/neighbour.c:3737 devinet_sysctl_unregister net/ipv4/devinet.c:2650 [inline] inetdev_destroy net/ipv4/devinet.c:326 [inline] inetdev_event+0x7df/0x1010 net/ipv4/devinet.c:1612 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:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers net/core/dev.c:2080 [inline] unregister_netdevice_many+0x100e/0x19f0 net/core/dev.c:10780 default_device_exit_batch+0x35e/0x3c0 net/core/dev.c:11300 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x5fe/0xb80 net/core/net_namespace.c:609 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447 kthread+0x324/0x3b0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff8881187cd800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881187cd800, ffff8881187cdc00) The buggy address belongs to the page: page:ffffea000461f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1187c8 head:ffffea000461f200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 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 84, ts 75407458275, free_ts 73736441281 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] syslog_print+0x127/0x720 kernel/printk/printk.c:1487 do_syslog+0x94c/0x9a0 kernel/printk/printk.c:1644 __do_sys_syslog kernel/printk/printk.c:1736 [inline] __se_sys_syslog kernel/printk/printk.c:1734 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1734 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page mm/page_alloc.c:5443 [inline] __free_pages+0x146/0x390 mm/page_alloc.c:5454 __vunmap+0x801/0x980 mm/vmalloc.c:2307 __vfree mm/vmalloc.c:2356 [inline] vfree+0x61/0x90 mm/vmalloc.c:2387 kvfree+0x26/0x40 mm/util.c:645 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:337 array_map_free+0x164/0x1d0 kernel/bpf/arraymap.c:-1 bpf_map_free_deferred+0xaf/0x110 kernel/bpf/syscall.c:486 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447 kthread+0x324/0x3b0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Memory state around the buggy address: ffff8881187cda80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881187cdb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881187cdb80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8881187cdc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881187cdc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================