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BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline]
BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:300 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x305/0x2e60 lib/iov_iter.c:185
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 copy_to_user_iter lib/iov_iter.c:24 [inline]
 iterate_ubuf include/linux/iov_iter.h:30 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:300 [inline]
 iterate_and_advance include/linux/iov_iter.h:328 [inline]
 _copy_to_iter+0x305/0x2e60 lib/iov_iter.c:185
 copy_to_iter include/linux/uio.h:220 [inline]
 simple_copy_to_iter net/core/datagram.c:524 [inline]
 __skb_datagram_iter+0x18d/0x1190 net/core/datagram.c:401
 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:538
 skb_copy_datagram_msg include/linux/skbuff.h:4144 [inline]
 packet_recvmsg+0xdde/0x25b0 net/packet/af_packet.c:3527
 sock_recvmsg_nosec net/socket.c:1023 [inline]
 sock_recvmsg+0x2c4/0x340 net/socket.c:1045
 ____sys_recvmsg+0x18a/0x620 net/socket.c:2793
 ___sys_recvmsg+0x223/0x840 net/socket.c:2835
 do_recvmmsg+0x45a/0xfc0 net/socket.c:2930
 __sys_recvmmsg net/socket.c:3004 [inline]
 __do_sys_recvmmsg net/socket.c:3027 [inline]
 __se_sys_recvmmsg net/socket.c:3020 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3020
 x64_sys_call+0x35ba/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:515
 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:606
 alloc_skb_fclone include/linux/skbuff.h:1381 [inline]
 tipc_buf_acquire+0x4c/0x230 net/tipc/msg.c:72
 tipc_disc_create+0x134/0x840 net/tipc/discover.c:359
 tipc_enable_bearer net/tipc/bearer.c:348 [inline]
 __tipc_nl_bearer_enable+0x1ef0/0x2ad0 net/tipc/bearer.c:1047
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:371 [inline]
 tipc_nl_compat_doit+0x71d/0xa00 net/tipc/netlink_compat.c:393
 tipc_nl_compat_recv+0xfc0/0x1640 net/tipc/netlink_compat.c:1321
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2533
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:733
 ____sys_sendmsg+0x890/0xda0 net/socket.c:2573
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627
 __sys_sendmsg net/socket.c:2659 [inline]
 __do_sys_sendmsg net/socket.c:2664 [inline]
 __se_sys_sendmsg net/socket.c:2662 [inline]
 __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662
 x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Bytes 4-5 of 17 are uninitialized
Memory access of size 17 starts at ffff88804c7fcba4
Data copied to user address 000020000000000a

CPU: 1 UID: 0 PID: 15158 Comm: syz.5.5169 Tainted: G        W          6.14.0-rc7-syzkaller-00205-g586de92313fc #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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