==================================================================
BUG: KASAN: slab-use-after-free in __sk_msg_recvmsg+0x91c/0xfc0
Read of size 4 at addr ffff88810a8f1028 by task syz.0.1754/13343

CPU: 1 UID: 0 PID: 13343 Comm: syz.0.1754 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 __sk_msg_recvmsg+0x91c/0xfc0
 udp_bpf_recvmsg+0x196/0xac0
 sock_recvmsg+0x155/0x1b0
 ____sys_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x215/0x590
 do_recvmmsg+0x334/0x800
 __x64_sys_recvmmsg+0x198/0x250
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efc0139ce59
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:00007efc021bd028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007efc01616180 RCX: 00007efc0139ce59
RDX: 0000000000000012 RSI: 0000200000000400 RDI: 0000000000000008
RBP: 00007efc01432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000040000021 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc01616218 R14: 00007efc01616180 R15: 00007fff7600ea08
 </TASK>

Allocated by task 13340:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 sk_psock_skb_ingress_self+0x5e/0x370
 sk_psock_verdict_recv+0x7d9/0x8d0
 udp_read_skb+0x5d9/0x6b0
 sk_psock_verdict_data_ready+0x49c/0x9a0
 __udp_enqueue_schedule_skb+0xc4b/0x12e0
 udp_queue_rcv_one_skb+0x755/0x10f0
 __udp4_lib_mcast_deliver+0xad7/0xb70
 udp_rcv+0xcd0/0x1db0
 ip_protocol_deliver_rcu+0x282/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x336/0x3c0
 ip_sublist_rcv_finish+0x1f0/0x240
 ip_sublist_rcv+0x5c6/0xa70
 ip_list_rcv+0x3f1/0x450
 __netif_receive_skb_list_core+0x7e5/0x810
 netif_receive_skb_list_internal+0x995/0xcf0
 netif_receive_skb_list+0x55/0x450
 bpf_test_run_xdp_live+0x1946/0x1cf0
 bpf_prog_test_run_xdp+0x81c/0x1160
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x643/0x950
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 13341:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 __sk_msg_recvmsg+0xdb7/0xfc0
 udp_bpf_recvmsg+0x196/0xac0
 sock_recvmsg+0x155/0x1b0
 ____sys_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x215/0x590
 do_recvmmsg+0x334/0x800
 __x64_sys_recvmmsg+0x198/0x250
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810a8f1000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 40 bytes inside of
 freed 1024-byte region [ffff88810a8f1000, ffff88810a8f1400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a8f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888100041dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100041dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5865, tgid 5864 (syz.0.30), ts 73152316735, free_ts 72419699825
 post_alloc_hook+0x22d/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x339/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 __kvmalloc_node_noprof+0x657/0x8a0
 rhashtable_init_noprof+0x52e/0xad0
 fqdir_init+0xac/0x180
 ipv6_frags_init_net+0x2f/0x2a0
 ops_init+0x35c/0x5c0
 setup_net+0x118/0x340
 copy_net_ns+0x50e/0x730
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x149/0x190
 ksys_unshare+0x57d/0x9f0
page last free pid 5817 tgid 5814 stack trace:
 __free_frozen_pages+0xbc7/0xd30
 __folio_put+0x4a2/0x580
 skb_release_data+0x544/0xa60
 skb_attempt_defer_free+0x557/0x770
 __tcp_close+0x2d0/0xfe0
 tcp_close+0x28/0x110
 tls_sk_proto_close+0x612/0x8c0
 inet_release+0x143/0x190
 sock_close+0xc3/0x240
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 get_signal+0x11eb/0x1330
 arch_do_signal_or_restart+0xbc/0x840
 exit_to_user_mode_loop+0x8c/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88810a8f0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810a8f0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810a8f1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88810a8f1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810a8f1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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