------------[ cut here ]------------ memcpy: detected field-spanning write (size 17) of single field "pfx->in6_u.u6_addr8" at ./include/net/ipv6.h:614 (size 16) WARNING: CPU: 1 PID: 21159 at ./include/net/ipv6.h:614 ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614 Modules linked in: CPU: 1 UID: 0 PID: 21159 Comm: syz.4.4054 Not tainted 6.16.0-rc1-syzkaller-00004-gaef17cb3d3c4 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614 Code: cc e8 90 95 ab f7 c6 05 30 30 75 05 01 90 b9 10 00 00 00 48 c7 c7 a0 89 9e 8c 4c 89 fe 48 c7 c2 c0 90 9e 8c e8 ad 40 6f f7 90 <0f> 0b 90 90 e9 33 ff ff ff e8 5e 95 ab f7 44 89 e6 48 c7 c7 c0 b5 RSP: 0018:ffffc90003b3eb30 EFLAGS: 00010246 RAX: e733bfda844ae100 RBX: ffff88805b669050 RCX: 0000000000080000 RDX: ffffc90013a26000 RSI: 0000000000004951 RDI: 0000000000004952 RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa9ec R12: 0000000000000011 R13: 1ffff92000767d89 R14: ffffc90003b3ec64 R15: 0000000000000011 FS: 00007fae32b936c0(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae32b92f98 CR3: 0000000068936000 CR4: 00000000003526f0 DR0: 0000000000000007 DR1: 0000000000000005 DR2: 0000000000000007 DR3: 00000000000002d5 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: ip6_route_info_create+0x4af/0x860 net/ipv6/route.c:3793 ip6_route_add+0x28/0x190 net/ipv6/route.c:3889 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+0xe0b/0x15c0 net/ipv6/ip6_input.c:436 ip6_input_finish+0xde/0x190 net/ipv6/ip6_input.c:480 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:317 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:491 ip6_mc_input+0x79a/0xbe0 net/ipv6/ip6_input.c:588 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:317 __netif_receive_skb_one_core net/core/dev.c:5977 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6090 netif_receive_skb_internal net/core/dev.c:6176 [inline] netif_receive_skb+0x1cb/0x790 net/core/dev.c:6235 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485 tun_get_user+0x298e/0x3ce0 drivers/net/tun.c:1938 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1984 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fae31d8d3df Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007fae32b93000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fae31fb5fa0 RCX: 00007fae31d8d3df RDX: 00000000000000a6 RSI: 0000200000000000 RDI: 00000000000000c8 RBP: 00007fae31e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000a6 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fae31fb5fa0 R15: 00007fffa7439d38