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BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]
BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:169 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x870/0x1fd0 lib/iov_iter.c:523
 instrument_copy_to_user include/linux/instrumented.h:121 [inline]
 copyout lib/iov_iter.c:169 [inline]
 _copy_to_iter+0x870/0x1fd0 lib/iov_iter.c:523
 copy_to_iter include/linux/uio.h:181 [inline]
 simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:513
 __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:419
 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:527
 skb_copy_datagram_msg include/linux/skbuff.h:3933 [inline]
 packet_recvmsg+0x516/0x1ed0 net/packet/af_packet.c:3467
 sock_recvmsg_nosec net/socket.c:1015 [inline]
 sock_recvmsg net/socket.c:1036 [inline]
 sock_read_iter+0x48e/0x5d0 net/socket.c:1114
 call_read_iter include/linux/fs.h:1845 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x8cd/0xf40 fs/read_write.c:470
 ksys_read+0x21f/0x4f0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x93/0xd0 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:774
 slab_alloc_node mm/slub.c:3452 [inline]
 kmem_cache_alloc_node+0x543/0xab0 mm/slub.c:3497
 kmalloc_reserve+0x14b/0x3e0 net/core/skbuff.c:525
 __alloc_skb+0x3a7/0x850 net/core/skbuff.c:608
 alloc_skb_fclone include/linux/skbuff.h:1327 [inline]
 tipc_buf_acquire+0x4c/0x230 net/tipc/msg.c:72
 tipc_disc_create+0x134/0x810 net/tipc/discover.c:359
 tipc_enable_bearer net/tipc/bearer.c:346 [inline]
 __tipc_nl_bearer_enable+0x1820/0x2250 net/tipc/bearer.c:1032
 tipc_nl_bearer_enable+0x3c/0x70 net/tipc/bearer.c:1041
 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
 genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065
 netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2574
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942
 sock_sendmsg_nosec net/socket.c:722 [inline]
 sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0xa24/0xe40 net/socket.c:2504
 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2558
 __sys_sendmsg net/socket.c:2587 [inline]
 __do_sys_sendmsg net/socket.c:2596 [inline]
 __se_sys_sendmsg net/socket.c:2594 [inline]
 __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2594
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Bytes 4-5 of 120 are uninitialized
Memory access of size 120 starts at ffff888065b119a4
Data copied to user address 00000000200001c0

CPU: 1 PID: 16993 Comm: syz-executor.0 Tainted: G        W          6.3.0-rc1-syzkaller-ge61893130d87 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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