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BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855
Read of size 1 at addr ffff8881c2cc4bd8 by task syz.0.2533/9579

CPU: 1 PID: 9579 Comm: syz.0.2533 Tainted: G        W         5.4.290-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129
 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855
 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:987 [inline]
 xfrm_policy_inexact_insert_node+0x923/0xb10 net/xfrm/xfrm_policy.c:1043
 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1159
 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1202
 xfrm_policy_insert+0xe7/0x940 net/xfrm/xfrm_policy.c:1585
 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1720
 xfrm_user_rcv_msg+0x689/0x9b0 net/xfrm/xfrm_user.c:2775
 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2467
 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:2797
 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline]
 netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1332
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306
 ___sys_sendmsg net/socket.c:2360 [inline]
 __sys_sendmsg+0x28b/0x380 net/socket.c:2406
 __do_sys_sendmsg net/socket.c:2415 [inline]
 __se_sys_sendmsg net/socket.c:2413 [inline]
 __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2413
 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fe73ddad169
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:00007fe73c416038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe73dfd4fa0 RCX: 00007fe73ddad169
RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006
RBP: 00007fe73de2fa68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe73dfd4fa0 R15: 00007fffa160bbd8

Allocated by task 9579:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:543
 __kmalloc+0x129/0x2e0 mm/slub.c:3913
 kmalloc include/linux/slab.h:561 [inline]
 sk_prot_alloc+0xc2/0x440 net/core/sock.c:1622
 sk_alloc+0x39/0x310 net/core/sock.c:1680
 pfkey_create+0x12c/0x650 net/key/af_key.c:154
 __sock_create+0x3ce/0x790 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0x132/0x370 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1527
 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 9138:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kfree+0x123/0x360 mm/slub.c:4071
 skb_free_head net/core/skbuff.c:601 [inline]
 skb_release_data+0x525/0x650 net/core/skbuff.c:621
 skb_release_all net/core/skbuff.c:675 [inline]
 __kfree_skb net/core/skbuff.c:689 [inline]
 consume_skb+0xac/0x2a0 net/core/skbuff.c:849
 netlink_broadcast_filtered+0x114c/0x1270 net/netlink/af_netlink.c:1516
 netlink_broadcast net/netlink/af_netlink.c:1538 [inline]
 nlmsg_multicast include/net/netlink.h:968 [inline]
 nlmsg_notify+0x101/0x1c0 net/netlink/af_netlink.c:2510
 rtnl_notify+0x9c/0xd0 net/core/rtnetlink.c:737
 inet6_rt_notify+0x3c8/0x550 net/ipv6/route.c:6000
 fib6_add_rt2node net/ipv6/ip6_fib.c:1187 [inline]
 fib6_add+0x2444/0x3df0 net/ipv6/ip6_fib.c:1416
 __ip6_ins_rt net/ipv6/route.c:1322 [inline]
 ip6_route_add+0x8a/0x130 net/ipv6/route.c:3766
 addrconf_prefix_route net/ipv6/addrconf.c:2443 [inline]
 fixup_permanent_addr net/ipv6/addrconf.c:3504 [inline]
 addrconf_permanent_addr+0x761/0xba0 net/ipv6/addrconf.c:3528
 addrconf_notify+0x78d/0xec0 net/ipv6/addrconf.c:3598
 notifier_call_chain kernel/notifier.c:98 [inline]
 __raw_notifier_call_chain kernel/notifier.c:399 [inline]
 raw_notifier_call_chain+0x9f/0x110 kernel/notifier.c:406
 __dev_notify_flags+0x26e/0x510 net/core/dev.c:1670
 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8034
 do_setlink+0xc4c/0x3b70 net/core/rtnetlink.c:2542
 __rtnl_newlink net/core/rtnetlink.c:3188 [inline]
 rtnl_newlink+0x16bc/0x2060 net/core/rtnetlink.c:3314
 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5290
 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2467
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5308
 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline]
 netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1332
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 __sys_sendto+0x4f3/0x6c0 net/socket.c:1961
 __do_sys_sendto net/socket.c:1973 [inline]
 __se_sys_sendto net/socket.c:1969 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:1969
 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881c2cc4800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 984 bytes inside of
 1024-byte region [ffff8881c2cc4800, ffff8881c2cc4c00)
The buggy address belongs to the page:
page:ffffea00070b3000 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 ffffea0007850a00 0000000600000006 ffff8881f5c02280
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)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x192/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x3b/0x400 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x98/0x430 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2e0/0x460 mm/slub.c:2667
 __slab_alloc+0x63/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 __kmalloc_track_caller+0x17f/0x2c0 mm/slub.c:4449
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xbc/0x4f0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1080 [inline]
 alloc_uevent_skb+0x80/0x230 lib/kobject_uevent.c:290
 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
 kobject_uevent_net_broadcast+0x188/0x590 lib/kobject_uevent.c:412
 kobject_uevent_env+0x53a/0x6f0 lib/kobject_uevent.c:608
 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:657
 rx_queue_add_kobject net/core/net-sysfs.c:988 [inline]
 net_rx_queue_update_kobjects+0x1e3/0x430 net/core/net-sysfs.c:1010
 register_queue_kobjects net/core/net-sysfs.c:1632 [inline]
 netdev_register_kobject+0x231/0x320 net/core/net-sysfs.c:1858
 register_netdevice+0xbc5/0x12a0 net/core/dev.c:9209
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x2a3/0x390 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 __vunmap+0x730/0x870 mm/vmalloc.c:2260
 __vfree mm/vmalloc.c:2308 [inline]
 vfree+0x5c/0x80 mm/vmalloc.c:2338
 kvfree+0x37/0x50 mm/util.c:623
 btf_free kernel/bpf/btf.c:902 [inline]
 btf_parse kernel/bpf/btf.c:3372 [inline]
 btf_new_fd+0x90c/0x1110 kernel/bpf/btf.c:3416
 bpf_btf_load kernel/bpf/syscall.c:2705 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2936 [inline]
 __se_sys_bpf+0x141d/0xbd60 kernel/bpf/syscall.c:2849
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849
 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881c2cc4a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c2cc4b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881c2cc4b80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                                    ^
 ffff8881c2cc4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881c2cc4c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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