netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'.
=====================================================
BUG: KMSAN: uninit-value in ip_route_output_key_hash_rcu+0x281/0x4070 net/ipv4/route.c:2660
 ip_route_output_key_hash_rcu+0x281/0x4070 net/ipv4/route.c:2660
 ip_route_output_key_hash net/ipv4/route.c:2643 [inline]
 __ip_route_output_key include/net/route.h:140 [inline]
 ip_route_output_flow+0x1fc/0x4b0 net/ipv4/route.c:2873
 ipvlan_process_v4_outbound drivers/net/ipvlan/ipvlan_core.c:430 [inline]
 ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:525 [inline]
 ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:587 [inline]
 ipvlan_queue_xmit+0x1936/0x2db0 drivers/net/ipvlan/ipvlan_core.c:651
 ipvlan_start_xmit+0xa5/0x2d0 drivers/net/ipvlan/ipvlan_main.c:222
 __netdev_start_xmit include/linux/netdevice.h:4865 [inline]
 netdev_start_xmit include/linux/netdevice.h:4879 [inline]
 xmit_one net/core/dev.c:3583 [inline]
 dev_hard_start_xmit+0x321/0xb50 net/core/dev.c:3599
 sch_direct_xmit+0x5f0/0x1400 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0x1614/0x3e90 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3873 [inline]
 __dev_queue_xmit+0x241a/0x6290 net/core/dev.c:4215
 dev_queue_xmit+0x4f/0x60 include/linux/netdevice.h:3035
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x8b92/0xa180 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 sock_write_iter+0x583/0x680 net/socket.c:1108
 call_write_iter include/linux/fs.h:2189 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xc5c/0x1a60 fs/read_write.c:584
 ksys_write+0x28f/0x510 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __ia32_sys_write+0xdf/0x120 fs/read_write.c:646
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was stored to memory at:
 ipvlan_process_v4_outbound drivers/net/ipvlan/ipvlan_core.c:421 [inline]
 ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:525 [inline]
 ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:587 [inline]
 ipvlan_queue_xmit+0x2419/0x2db0 drivers/net/ipvlan/ipvlan_core.c:651
 ipvlan_start_xmit+0xa5/0x2d0 drivers/net/ipvlan/ipvlan_main.c:222
 __netdev_start_xmit include/linux/netdevice.h:4865 [inline]
 netdev_start_xmit include/linux/netdevice.h:4879 [inline]
 xmit_one net/core/dev.c:3583 [inline]
 dev_hard_start_xmit+0x321/0xb50 net/core/dev.c:3599
 sch_direct_xmit+0x5f0/0x1400 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0x1614/0x3e90 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3873 [inline]
 __dev_queue_xmit+0x241a/0x6290 net/core/dev.c:4215
 dev_queue_xmit+0x4f/0x60 include/linux/netdevice.h:3035
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x8b92/0xa180 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 sock_write_iter+0x583/0x680 net/socket.c:1108
 call_write_iter include/linux/fs.h:2189 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xc5c/0x1a60 fs/read_write.c:584
 ksys_write+0x28f/0x510 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __ia32_sys_write+0xdf/0x120 fs/read_write.c:646
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook+0x271/0xf70 mm/slab.h:766
 slab_alloc_node mm/slub.c:3452 [inline]
 __kmem_cache_alloc_node+0x68c/0xac0 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc_node_track_caller+0x3df/0x710 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:492 [inline]
 __alloc_skb+0x56e/0xad0 net/core/skbuff.c:565
 alloc_skb include/linux/skbuff.h:1270 [inline]
 alloc_skb_with_frags+0x1c8/0xcf0 net/core/skbuff.c:6194
 sock_alloc_send_pskb+0xde6/0xfc0 net/core/sock.c:2743
 packet_alloc_skb net/packet/af_packet.c:2921 [inline]
 packet_snd net/packet/af_packet.c:3016 [inline]
 packet_sendmsg+0x6bda/0xa180 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 sock_write_iter+0x583/0x680 net/socket.c:1108
 call_write_iter include/linux/fs.h:2189 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xc5c/0x1a60 fs/read_write.c:584
 ksys_write+0x28f/0x510 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __ia32_sys_write+0xdf/0x120 fs/read_write.c:646
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 5567 Comm: syz-executor.2 Not tainted 6.2.0-rc8-syzkaller-80998-g9c866a280876 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================