Re: [syzbot] [net?] WARNING in geneve_udp_encap_recv

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

syzbot has found a reproducer for the following issue on:

HEAD commit:    f44d154d6e3d Merge tag 'soc-fixes-6.13' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e95730580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4f1586bab1323870
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
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=133e8b44580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10fa4744580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-f44d154d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d57bbc97217e/vmlinux-f44d154d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/345444afe36f/bzImage-f44d154d.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 8) 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: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 ip_tunnel_info_opts_set include/net/ip_tunnels.h:662 [inline]
WARNING: CPU: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 geneve_rx drivers/net/geneve.c:244 [inline]
WARNING: CPU: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 geneve_udp_encap_recv+0x239e/0x2a20 drivers/net/geneve.c:401
Modules linked in:
CPU: 2 UID: 0 PID: 5932 Comm: syz-executor272 Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #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 d3 37 4d fb c6 05 cb 02 fb 09 01 90 31 c9 48 c7 c2 a0 e7 14 8c 4c 89 e6 48 c7 c7 80 e8 14 8c e8 53 72 0d fb 90 <0f> 0b 90 90 e9 54 ed ff ff e8 a4 37 4d fb e8 4f 30 c5 02 31 ff 41
RSP: 0018:ffffc900037bf450 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888035210062 RCX: ffffffff815a5079
RDX: ffff8880232f0000 RSI: ffffffff815a5086 RDI: 0000000000000001
RBP: ffffc900037bf570 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000008
R13: ffff88802cbfda00 R14: 0000000000000000 R15: ffff888024a2fb80
FS:  0000555562a2b380(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c0 CR3: 00000000230b2000 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:2316
 udp_queue_rcv_skb+0x198/0xd10 net/ipv4/udp.c:2394
 __udp4_lib_mcast_deliver net/ipv4/udp.c:2486 [inline]
 __udp4_lib_rcv+0x25c4/0x34e0 net/ipv4/udp.c:2625
 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
 netif_receive_skb_internal net/core/dev.c:5871 [inline]
 netif_receive_skb+0x13f/0x7b0 net/core/dev.c:5930
 tun_rx_batched.isra.0+0x3eb/0x730 drivers/net/tun.c:1574
 tun_get_user+0x2a16/0x3e40 drivers/net/tun.c:2007
 tun_chr_write_iter+0xdc/0x210 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x5ae/0x1150 fs/read_write.c:679
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f293ab4f920
Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d 81 e7 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89
RSP: 002b:00007ffff606d388 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffff606d410 RCX: 00007f293ab4f920
RDX: 0000000000000048 RSI: 00000000200001c0 RDI: 00000000000000c8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffff606d3b0 R14: 00007f293ab9e140 R15: 0000555562a2b338
 </TASK>


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