[syzbot] [net?] WARNING in geneve_udp_encap_recv

[syzbot <syzbot+c28dd30bc14158282b3b@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    90602c251cda Merge tag 'net-6.12-rc6' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16519340580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4340261e4e9f37fc
dashboard link: https://syzkaller.appspot.com/bug?extid=c28dd30bc14158282b3b
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-90602c25.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a2daa3dcb25/vmlinux-90602c25.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4488ee6eec29/bzImage-90602c25.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c28dd30bc14158282b3b@syzkaller.appspotmail.com

memcpy: detected field-spanning write (size 4) 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:653 (size 0)
WARNING: CPU: 3 PID: 34 at include/net/ip_tunnels.h:653 ip_tunnel_info_opts_set include/net/ip_tunnels.h:653 [inline]
WARNING: CPU: 3 PID: 34 at include/net/ip_tunnels.h:653 geneve_rx drivers/net/geneve.c:244 [inline]
WARNING: CPU: 3 PID: 34 at include/net/ip_tunnels.h:653 geneve_udp_encap_recv+0x22cd/0x29a0 drivers/net/geneve.c:401
Modules linked in:
CPU: 3 UID: 0 PID: 34 Comm: ksoftirqd/3 Not tainted 6.12.0-rc5-syzkaller-00161-g90602c251cda #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:653 [inline]
RIP: 0010:geneve_rx drivers/net/geneve.c:244 [inline]
RIP: 0010:geneve_udp_encap_recv+0x22cd/0x29a0 drivers/net/geneve.c:401
Code: 9e e9 ff ff e8 24 ca 53 fb c6 05 c4 65 0e 0a 01 90 31 c9 48 c7 c2 e0 3e 14 8c 4c 89 e6 48 c7 c7 c0 3f 14 8c e8 c4 b9 14 fb 90 <0f> 0b 90 90 e9 c7 ed ff ff e8 f5 c9 53 fb e8 80 8c c9 02 31 ff 41
RSP: 0018:ffffc900008df630 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888060da0f32 RCX: ffffffff814e6dd9
RDX: ffff88801e294880 RSI: ffffffff814e6de6 RDI: 0000000000000001
RBP: ffffc900008df750 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
R13: ffff888032d57c00 R14: 0000000000000000 R15: ffff88804583ef00
FS:  0000000000000000(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1e8385f98 CR3: 000000004b406000 CR4: 0000000000352ef0
DR0: 00000000e0002800 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udp_queue_rcv_one_skb+0xad5/0x18c0 net/ipv4/udp.c:2135
 udp_queue_rcv_skb+0x198/0xd10 net/ipv4/udp.c:2213
 udp_unicast_rcv_skb+0x165/0x3b0 net/ipv4/udp.c:2373
 __udp4_lib_rcv+0x25fd/0x34e0 net/ipv4/udp.c:2449
 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:449 [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:569
 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5670
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5783
 process_backlog+0x443/0x15f0 net/core/dev.c:6115
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6779
 napi_poll net/core/dev.c:6848 [inline]
 net_rx_action+0xa92/0x1010 net/core/dev.c:6970
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
 run_ksoftirqd kernel/softirq.c:927 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:919
 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>


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