------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in net/ipv6/route.c:1095:9
index 255 is out of range for type 'const int[12]'
CPU: 0 UID: 0 PID: 9954 Comm: syz.3.1077 Not tainted 6.15.0-rc3-syzkaller-00584-gcc17b4b9c332 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:231
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:453
 ip6_rt_type_to_error net/ipv6/route.c:1095 [inline]
 ip6_rt_init_dst_reject net/ipv6/route.c:1112 [inline]
 ip6_rt_init_dst net/ipv6/route.c:1137 [inline]
 ip6_rt_copy_init+0x8e7/0x970 net/ipv6/route.c:1175
 ip6_rt_pcpu_alloc net/ipv6/route.c:1424 [inline]
 rt6_make_pcpu_route net/ipv6/route.c:1467 [inline]
 ip6_pol_route+0xbac/0x1180 net/ipv6/route.c:2302
 pol_lookup_func include/net/ip6_fib.h:617 [inline]
 fib6_rule_lookup+0x348/0x6f0 net/ipv6/fib6_rules.c:125
 ip6_route_output_flags_noref net/ipv6/route.c:2674 [inline]
 ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2686
 ip6_dst_lookup_tail+0x299/0x1510 net/ipv6/ip6_output.c:1156
 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1259
 tcp_v6_connect+0xbce/0x1830 net/ipv6/tcp_ipv6.c:277
 __inet_stream_connect+0x295/0xf10 net/ipv4/af_inet.c:677
 tcp_sendmsg_fastopen+0x3a7/0x5e0 net/ipv4/tcp.c:1047
 tcp_sendmsg_locked+0x491a/0x5010 net/ipv4/tcp.c:1099
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1368
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0xe5/0x270 net/socket.c:727
 __sys_sendto+0x3bd/0x520 net/socket.c:2180
 __do_sys_sendto net/socket.c:2187 [inline]
 __se_sys_sendto net/socket.c:2183 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2183
 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: 0033:0x7f9c7498e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9c7584a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9c74bb6080 RCX: 00007f9c7498e969
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f9c74a10ab1 R08: 00002000000001c0 R09: 000000000000001c
R10: 0000000020000045 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9c74bb6080 R15: 00007ffd1cee4b98
 </TASK>
---[ end trace ]---