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BUG: KMSAN: uninit-value in validate_set+0x196/0x15d0 net/openvswitch/flow_netlink.c:2868
 validate_set+0x196/0x15d0 net/openvswitch/flow_netlink.c:2868
 __ovs_nla_copy_actions+0x2596/0x6840 net/openvswitch/flow_netlink.c:3342
 ovs_nla_copy_actions+0x342/0x530 net/openvswitch/flow_netlink.c:3489
 ovs_flow_cmd_new+0x956/0x18b0 net/openvswitch/datapath.c:1023
 genl_family_rcv_msg_doit net/netlink/genetlink.c:970 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1050 [inline]
 genl_rcv_msg+0x1328/0x13c0 net/netlink/genetlink.c:1067
 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2549
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1078
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0xf28/0x1230 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x122f/0x13d0 net/netlink/af_netlink.c:1914
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg net/socket.c:748 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2494
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2548
 __sys_sendmsg net/socket.c:2577 [inline]
 __do_sys_sendmsg net/socket.c:2586 [inline]
 __se_sys_sendmsg net/socket.c:2584 [inline]
 __x64_sys_sendmsg+0x307/0x490 net/socket.c:2584
 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+0x12f/0xb70 mm/slab.h:767
 slab_alloc_node mm/slub.c:3470 [inline]
 kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3515
 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:559
 __alloc_skb+0x318/0x740 net/core/skbuff.c:644
 alloc_skb include/linux/skbuff.h:1289 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1211 [inline]
 netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg net/socket.c:748 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2494
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2548
 __sys_sendmsg net/socket.c:2577 [inline]
 __do_sys_sendmsg net/socket.c:2586 [inline]
 __se_sys_sendmsg net/socket.c:2584 [inline]
 __x64_sys_sendmsg+0x307/0x490 net/socket.c:2584
 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

CPU: 1 PID: 19782 Comm: syz-executor.4 Not tainted 6.5.0-rc2-syzkaller-00046-gccff6d117d8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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