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BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:131 [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:302 [inline]
BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:330 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xef3/0x3400 lib/iov_iter.c:197
 instrument_copy_to_user include/linux/instrumented.h:131 [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:302 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 _copy_to_iter+0xef3/0x3400 lib/iov_iter.c:197
 copy_to_iter include/linux/uio.h:220 [inline]
 simple_copy_to_iter net/core/datagram.c:521 [inline]
 __skb_datagram_iter+0x18f/0x12b0 net/core/datagram.c:402
 skb_copy_datagram_iter+0x5b/0x240 net/core/datagram.c:535
 skb_copy_datagram_msg include/linux/skbuff.h:4218 [inline]
 packet_recvmsg+0xe34/0x2510 net/packet/af_packet.c:3473
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg+0x2d9/0x380 net/socket.c:1100
 ____sys_recvmsg+0x193/0x620 net/socket.c:2812
 ___sys_recvmsg+0x20b/0x850 net/socket.c:2854
 __sys_recvmsg+0x1a7/0x300 net/socket.c:2887
 __compat_sys_recvmsg net/compat.c:374 [inline]
 __do_compat_sys_recvmsg net/compat.c:381 [inline]
 __se_compat_sys_recvmsg net/compat.c:378 [inline]
 __ia32_compat_sys_recvmsg+0xa4/0x100 net/compat.c:378
 ia32_sys_call+0xfce/0x4360 arch/x86/include/generated/asm/syscalls_32.h:373
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4508 [inline]
 slab_alloc_node mm/slub.c:4830 [inline]
 kmem_cache_alloc_node_noprof+0x3cd/0x12d0 mm/slub.c:4882
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x855/0x1190 net/core/skbuff.c:713
 alloc_skb_fclone include/linux/skbuff.h:1433 [inline]
 tipc_buf_acquire+0x4c/0x230 net/tipc/msg.c:72
 tipc_disc_create+0x12f/0x870 net/tipc/discover.c:359
 tipc_enable_bearer net/tipc/bearer.c:348 [inline]
 __tipc_nl_bearer_enable+0x1f61/0x2a00 net/tipc/bearer.c:1047
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:371 [inline]
 tipc_nl_compat_doit+0x67b/0xa10 net/tipc/netlink_compat.c:393
 tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline]
 tipc_nl_compat_recv+0xfce/0x1630 net/tipc/netlink_compat.c:1321
 genl_family_rcv_msg_doit+0x338/0x3f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xac5/0xc00 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2550
 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x10b2/0x1250 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xfe7/0x1080 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg+0x1aa/0x300 net/socket.c:2678
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0xa4/0x100 net/compat.c:350
 ia32_sys_call+0x1e4a/0x4360 arch/x86/include/generated/asm/syscalls_32.h:371
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x17f/0x3f0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Bytes 4-5 of 120 are uninitialized
Memory access of size 120 starts at ffff888128f43a64
Data copied to user address 000000008000144a

CPU: 0 UID: 0 PID: 12722 Comm: syz.5.2500 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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