syzbot

memcpy: detected field-spanning write (size 16) of single field "_Generic(info, const struct ip_tunnel_info * : ((const void *)((info) + 1)), struct ip_tunnel_info * : ((void *)((info) + 1)) )" at include/net/ip_tunnels.h:662 (size 0)
WARNING: CPU: 0 PID: 16 at include/net/ip_tunnels.h:662 ip_tunnel_info_opts_set include/net/ip_tunnels.h:662 [inline]
WARNING: CPU: 0 PID: 16 at include/net/ip_tunnels.h:662 geneve_rx drivers/net/geneve.c:244 [inline]
WARNING: CPU: 0 PID: 16 at include/net/ip_tunnels.h:662 geneve_udp_encap_recv+0x239e/0x2a20 drivers/net/geneve.c:401
Modules linked in:
CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ip_tunnel_info_opts_set include/net/ip_tunnels.h:662 [inline]
RIP: 0010:geneve_rx drivers/net/geneve.c:244 [inline]
RIP: 0010:geneve_udp_encap_recv+0x239e/0x2a20 drivers/net/geneve.c:401
Code: 2b e9 ff ff e8 53 57 4d fb c6 05 5d e9 07 0a 01 90 31 c9 48 c7 c2 80 cc 14 8c 4c 89 e6 48 c7 c7 60 cd 14 8c e8 23 a8 0d fb 90 <0f> 0b 90 90 e9 54 ed ff ff e8 24 57 4d fb e8 8f 50 cb 02 31 ff 41
RSP: 0018:ffffc90000137630 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88804edcd532 RCX: ffffffff814f0d59
RDX: ffff88801d680000 RSI: ffffffff814f0d66 RDI: 0000000000000001
RBP: ffffc90000137750 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000010
R13: ffff88804ea9fc00 R14: 0000000000000000 R15: ffff88801e6848c0
FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff06fded08 CR3: 0000000031ae0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udp_queue_rcv_one_skb+0xad5/0x18b0 net/ipv4/udp.c:2324
 udp_queue_rcv_skb+0x198/0xd10 net/ipv4/udp.c:2402
 udp_unicast_rcv_skb+0x165/0x3b0 net/ipv4/udp.c:2562
 __udp4_lib_rcv+0x25fd/0x34e0 net/ipv4/udp.c:2638
 ip_protocol_deliver_rcu+0x2ff/0x4c0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:460 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:447 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:567
 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5672
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5785
 process_backlog+0x443/0x15f0 net/core/dev.c:6117
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6877
 napi_poll net/core/dev.c:6946 [inline]
 net_rx_action+0xa94/0x1010 net/core/dev.c:7068
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
 run_ksoftirqd kernel/softirq.c:943 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:935
 smpboot_thread_fn+0x661/0xa30 kernel/smpboot.c:164
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>