Runtime panic (invalid memory address or nil pointer dereference) when setting up registry for hidden paths in local AS #4364
Description
When trying to set up a registry for hidden segments locally (see config below), the control service has a runtime panic.
Tested version: SCIONLab package 4.6.2 on Ubuntu 22.04
Stack trace:
github.com/scionproto/scion/go/lib/log.HandlePanic
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/lib/log/log.go:132
runtime.gopanic
/usr/local/go/src/runtime/panic.go:1038
runtime.panicmem
/usr/local/go/src/runtime/panic.go:221
runtime.sigpanic
/usr/local/go/src/runtime/signal_unix.go:735
github.com/scionproto/scion/go/lib/infra/messenger.AddressRewriter.buildFullAddress
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/lib/infra/messenger/addr.go:178
github.com/scionproto/scion/go/lib/infra/messenger.AddressRewriter.redirectToQUIC
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/lib/infra/messenger/addr.go:108
github.com/scionproto/scion/go/lib/infra/messenger.AddressRewriter.RedirectToQUIC
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/lib/infra/messenger/addr.go:76
github.com/scionproto/scion/go/cs/onehop.(*AddressRewriter).RedirectToQUIC
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/cs/onehop/addr.go:67
github.com/scionproto/scion/go/pkg/grpc.(*QUICDialer).Dial
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/grpc/dialer.go:159
github.com/scionproto/scion/go/pkg/hiddenpath/grpc.(*Discoverer).Discover
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/grpc/discovery.go:37
github.com/scionproto/scion/go/pkg/hiddenpath.resolve
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/discovery.go:96
github.com/scionproto/scion/go/pkg/hiddenpath.RegistrationResolver.Resolve
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/discovery.go:55
github.com/scionproto/scion/go/pkg/hiddenpath.(*BeaconWriter).Write.func1
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/beaconwriter.go:108
github.com/scionproto/scion/go/pkg/hiddenpath.(*remoteWriter).run
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/beaconwriter.go:155
github.com/scionproto/scion/go/pkg/hiddenpath.(*BeaconWriter).Write.func3
/builds/PRV-PERRIG/scionlab/scion-builder/scion/go/pkg/hiddenpath/beaconwriter.go:123
The problematic line seems to be
if len(p.Metadata().Interfaces) == 0 { //when local ASso I assume that for the concrete path Metadata() returns nil.
HP config:
---
groups:
ffaa:1:1099-000a:
owner: 17-ffaa:1:1099
readers:
- 17-ffaa:1:1099
registries:
- 17-ffaa:1:1099
writers:
- 17-ffaa:1:1099
registration_policy_per_interface:
1:
- "ffaa:1:1099-000a"I haven't tested it with the up-to-date version in master yet, but the relevant code seems to be unchanged.