veth1_vlan: entered promiscuous mode
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BUG: KASAN: global-out-of-bounds in fib6_add_rt2node net/ipv6/ip6_fib.c:1102 [inline]
BUG: KASAN: global-out-of-bounds in fib6_add+0x3ced/0x4b60 net/ipv6/ip6_fib.c:1488
Read of size 4 at addr ffffffff9af9f5d0 by task syz-executor/6430

CPU: 1 UID: 0 PID: 6430 Comm: syz-executor Not tainted 6.15.0-rc7-syzkaller-00002-gb36ddb9210e6 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 fib6_add_rt2node net/ipv6/ip6_fib.c:1102 [inline]
 fib6_add+0x3ced/0x4b60 net/ipv6/ip6_fib.c:1488
 __ip6_ins_rt net/ipv6/route.c:1351 [inline]
 ip6_route_add+0x8d/0x1c0 net/ipv6/route.c:3900
 addrconf_prefix_route+0x2fd/0x510 net/ipv6/addrconf.c:2487
 fixup_permanent_addr net/ipv6/addrconf.c:3602 [inline]
 addrconf_permanent_addr net/ipv6/addrconf.c:3626 [inline]
 addrconf_notify+0x12c6/0x19e0 net/ipv6/addrconf.c:3698
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2176
 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
 call_netdevice_notifiers net/core/dev.c:2228 [inline]
 __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9393
 netif_change_flags+0x108/0x160 net/core/dev.c:9422
 do_setlink.constprop.0+0xddf/0x44b0 net/core/rtnetlink.c:3152
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065
 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955
 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 __sys_sendto+0x498/0x510 net/socket.c:2180
 __do_sys_sendto net/socket.c:2187 [inline]
 __se_sys_sendto net/socket.c:2183 [inline]
 __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3f027907fc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffcb80428f0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f3f034e4620 RCX: 00007f3f027907fc
RDX: 000000000000002c RSI: 00007f3f034e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffcb8042944 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f3f034e4670 R15: 0000000000000000
 </TASK>

The buggy address belongs to the variable:
 __key.0+0x10/0x40

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1af9f
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00006be7c8 ffffea00006be7c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff9af9f480: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
 ffffffff9af9f500: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
>ffffffff9af9f580: 00 f9 f9 f9 f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9
                                                 ^
 ffffffff9af9f600: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
 ffffffff9af9f680: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 00 00 f9 f9
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