------------[ cut here ]------------
memcpy: detected field-spanning write (size 20) of single field "pfx->in6_u.u6_addr8" at ./include/net/ipv6.h:614 (size 16)
WARNING: CPU: 1 PID: 5845 at ./include/net/ipv6.h:614 ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Modules linked in:
CPU: 1 UID: 0 PID: 5845 Comm: syz-executor411 Not tainted 6.15.0-rc3-syzkaller-00557-g5565acd1e6c4 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Code: cc e8 70 eb af f7 c6 05 b8 a8 59 05 01 90 b9 10 00 00 00 48 c7 c7 a0 86 7d 8c 4c 89 fe 48 c7 c2 c0 8d 7d 8c e8 4d 4a 74 f7 90 <0f> 0b 90 90 e9 33 ff ff ff e8 3e eb af f7 44 89 e6 48 c7 c7 c0 53
RSP: 0018:ffffc900040feb40 EFLAGS: 00010246
RAX: a984fa43b3c8cf00 RBX: ffff888033b3ac50 RCX: ffff8880331e5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000007 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba4b4 R12: 0000000000000014
R13: 1ffff9200081fd8e R14: ffffc900040fec84 R15: 0000000000000014
FS:  0000555590d1c380(0000) GS:ffff8881261b2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000003d8 CR3: 0000000076baa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_route_info_create+0x5cc/0xa70 net/ipv6/route.c:3810
 ip6_route_add+0x29/0x2f0 net/ipv6/route.c:3902
 addrconf_prefix_route+0x210/0x2c0 net/ipv6/addrconf.c:2487
 addrconf_prefix_rcv+0x60b/0x1610 net/ipv6/addrconf.c:2878
 ndisc_router_discovery+0x2015/0x35f0 net/ipv6/ndisc.c:1570
 icmpv6_rcv+0x139a/0x1c80 net/ipv6/icmp.c:988
 ip6_protocol_deliver_rcu+0xe08/0x15c0 net/ipv6/ip6_input.c:436
 ip6_input_finish+0xde/0x190 net/ipv6/ip6_input.c:480
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:491
 ip6_mc_input+0x79a/0xbe0 net/ipv6/ip6_input.c:588
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314
 __netif_receive_skb_one_core net/core/dev.c:5941 [inline]
 __netif_receive_skb+0xd3/0x380 net/core/dev.c:6054
 netif_receive_skb_internal net/core/dev.c:6140 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6199
 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
 tun_get_user+0x2879/0x3c20 drivers/net/tun.c:1938
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1984
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f919f5a07e0
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 a1 e8 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:00007ffff528f6f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffff528f780 RCX: 00007f919f5a07e0
RDX: 00000000000003b6 RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007ffff528f730 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f919f5ef18d
R13: 00007f919f5ef15d R14: 00007f919f5ef0c5 R15: 00007f919f5ef004
 </TASK>