SELinux: unrecognized netlink message: protocol=6 nlmsg_type=8192 sclass=netlink_xfrm_socket pid=7535 comm=syz.7.1750
==================================================================
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 ffff8881bec273d8 by task syz.7.1750/7535

CPU: 0 PID: 7535 Comm: syz.7.1750 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: 0033:0x7f31fe27b169
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:00007f31fc8e4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f31fe4a2fa0 RCX: 00007f31fe27b169
RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000007
RBP: 00007f31fe2fda68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f31fe4a2fa0 R15: 00007ffcd30c8e98

Allocated by task 7535:
 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 4772:
 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+0x50/0x70 net/core/skbuff.c:689
 sk_wmem_free_skb include/net/sock.h:1532 [inline]
 tcp_rtx_queue_unlink_and_free+0x227/0x6f0 include/net/tcp.h:1853
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3232 [inline]
 tcp_ack+0x20cb/0x6080 net/ipv4/tcp_input.c:3783
 tcp_rcv_established+0xd16/0x1a80 net/ipv4/tcp_input.c:5742
 tcp_v4_do_rcv+0x3d7/0x7d0 net/ipv4/tcp_ipv4.c:1598
 tcp_v4_rcv+0x219a/0x26f0 net/ipv4/tcp_ipv4.c:1990
 ip_protocol_deliver_rcu+0x2fe/0x660 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ip_local_deliver+0x2c6/0x5a0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:444 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:541 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:579 [inline]
 ip_sublist_rcv+0xc02/0xc80 net/ipv4/ip_input.c:587
 ip_list_rcv+0x477/0x4c0 net/ipv4/ip_input.c:621
 __netif_receive_skb_list_ptype net/core/dev.c:5034 [inline]
 __netif_receive_skb_list_core+0x6dd/0x8f0 net/core/dev.c:5082
 __netif_receive_skb_list net/core/dev.c:5134 [inline]
 netif_receive_skb_list_internal+0x944/0xc90 net/core/dev.c:5229
 gro_normal_list net/core/dev.c:5340 [inline]
 napi_complete_done+0x20a/0x580 net/core/dev.c:6071
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0xb6b/0x1250 drivers/net/virtio_net.c:1516
 napi_poll net/core/dev.c:6386 [inline]
 net_rx_action+0x53f/0x1160 net/core/dev.c:6454
 __do_softirq+0x24a/0x687 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881bec27000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 984 bytes inside of
 1024-byte region [ffff8881bec27000, ffff8881bec27400)
The buggy address belongs to the page:
page:ffffea0006fb0800 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0xffff8881bec21800 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5c02280
raw: ffff8881bec21800 0000000080100008 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 0x1f2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_MEMALLOC|__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
 __napi_alloc_skb+0x146/0x580 net/core/skbuff.c:516
 napi_alloc_skb include/linux/skbuff.h:2913 [inline]
 page_to_skb+0x3c/0x950 drivers/net/virtio_net.c:412
 receive_mergeable drivers/net/virtio_net.c:1001 [inline]
 receive_buf+0xde0/0x51c0 drivers/net/virtio_net.c:1111
 virtnet_receive drivers/net/virtio_net.c:1403 [inline]
 virtnet_poll+0x5f9/0x1250 drivers/net/virtio_net.c:1512
 napi_poll net/core/dev.c:6386 [inline]
 net_rx_action+0x53f/0x1160 net/core/dev.c:6454
 __do_softirq+0x24a/0x687 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19a/0x1c0 kernel/softirq.c:413
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_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages+0x91/0x140 mm/page_alloc.c:4961
 free_thread_stack kernel/fork.c:299 [inline]
 release_task_stack kernel/fork.c:439 [inline]
 put_task_stack+0x21d/0x260 kernel/fork.c:450
 finish_task_switch+0x24a/0x590 kernel/sched/core.c:3479
 context_switch kernel/sched/core.c:3611 [inline]
 __schedule+0xb0d/0x1320 kernel/sched/core.c:4307
 schedule_idle+0x54/0x80 kernel/sched/core.c:4403
 do_idle+0x609/0x660 kernel/sched/idle.c:288
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:356
 rest_init+0xe9/0xf0 init/main.c:707
 arch_call_rest_init+0xe/0x10 init/main.c:831
 start_kernel+0x6d9/0x81d init/main.c:1036
 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:492
 x86_64_start_kernel+0x60/0x63 arch/x86/kernel/head64.c:473
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

Memory state around the buggy address:
 ffff8881bec27280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881bec27300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881bec27380: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                                    ^
 ffff8881bec27400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881bec27480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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