================================================================== 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 ffff8881292f8bd8 by task syz.0.218/757 CPU: 1 PID: 757 Comm: syz.0.218 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+0xe2/0x130 mm/kasan/report.c:452 __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_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+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:1733 xfrm_user_rcv_msg+0x4d0/0x7b0 net/xfrm/xfrm_user.c:2789 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:2811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1f9/0x2c0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2726525e59 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:00007f2724f80028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f272679efa0 RCX: 00007f2726525e59 RDX: 0000000000004000 RSI: 0000200000000440 RDI: 0000000000000003 RBP: 00007f27265bbd6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f272679f038 R14: 00007f272679efa0 R15: 00007ffc8f490ba8 Allocated by task 757: 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+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a4/0x330 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/0x660 net/key/af_key.c:154 __sock_create+0x38d/0x770 net/socket.c:1436 sock_create net/socket.c:1487 [inline] __sys_socket+0xec/0x190 net/socket.c:1529 __do_sys_socket net/socket.c:1538 [inline] __se_sys_socket net/socket.c:1536 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1536 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 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054 qdisc_destroy+0x154/0x250 net/sched/sch_generic.c:1009 qdisc_put net/sched/sch_generic.c:1021 [inline] shutdown_scheduler_queue net/sched/sch_generic.c:1074 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2321 [inline] dev_shutdown+0x198/0x580 net/sched/sch_generic.c:1381 unregister_netdevice_many+0x93f/0x1a80 net/core/dev.c:10773 unregister_netdevice_queue+0x324/0x370 net/core/dev.c:10714 unregister_netdevice include/linux/netdevice.h:2937 [inline] __tun_detach+0xca6/0x1450 drivers/net/tun.c:697 tun_detach drivers/net/tun.c:713 [inline] tun_chr_close+0x92/0x140 drivers/net/tun.c:3486 __fput+0x2fb/0x770 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881292f8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881292f8800, ffff8881292f8c00) The buggy address belongs to the page: page:ffffea0004a4be00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1292f8 head:ffffea0004a4be00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042f00 raw: 0000000000000000 0000000080100010 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 326, ts 22206819710, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 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+0x2a6/0x450 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] __kmalloc+0x1fe/0x330 mm/slub.c:4034 __kmalloc_node include/linux/slab.h:421 [inline] kmalloc_node include/linux/slab.h:578 [inline] kzalloc_node include/linux/slab.h:678 [inline] qdisc_alloc+0x79/0x740 net/sched/sch_generic.c:864 qdisc_create_dflt+0x6b/0x3a0 net/sched/sch_generic.c:927 mq_init+0x2de/0x680 net/sched/sch_mq.c:90 qdisc_create_dflt+0x136/0x3a0 net/sched/sch_generic.c:934 attach_default_qdiscs net/sched/sch_generic.c:1113 [inline] dev_activate+0x118/0x11c0 net/sched/sch_generic.c:1167 __dev_open+0x3ea/0x500 net/core/dev.c:1551 __dev_change_flags+0x20d/0x6a0 net/core/dev.c:8547 dev_change_flags+0x88/0x1a0 net/core/dev.c:8618 dev_ifsioc+0x113/0xa90 net/core/dev_ioctl.c:230 page_owner free stack trace missing Memory state around the buggy address: ffff8881292f8a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881292f8b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881292f8b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8881292f8c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881292f8c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================