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fix all panics from calling NewTipSet on an empty set of blocks

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This commit is contained in:
whyrusleeping 2019-12-10 22:37:51 +01:00
parent 88f46d4539
commit 12eed004ae
2 changed files with 11 additions and 0 deletions
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6
chain/sync.go
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@ -941,6 +941,12 @@ func (syncer *Syncer) syncFork(ctx context.Context, from *types.TipSet, to *type
}
for cur := 0; cur < len(tips); {
if nts.Height() == 0 {
if !syncer.Genesis.Equals(nts) {
return nil, xerrors.Errorf("somehow synced chain that linked back to a different genesis (bad genesis: %s)", nts.Key())
}
return nil, xerrors.Errorf("synced chain forked at genesis, refusing to sync")
}
if nts.Equals(tips[cur]) {
return tips[:cur+1], nil

5
chain/types/tipset.go
View File

@ -10,6 +10,7 @@ import (
"github.com/ipfs/go-cid"
logging "github.com/ipfs/go-log"
cbg "github.com/whyrusleeping/cbor-gen"
"golang.org/x/xerrors"
)
var log = logging.Logger("types")
@ -95,6 +96,10 @@ func tipsetSortFunc(blks []*BlockHeader) func(i, j int) bool {
}
func NewTipSet(blks []*BlockHeader) (*TipSet, error) {
if len(blks) == 0 {
return nil, xerrors.Errorf("NewTipSet called with zero length array of blocks")
}
sort.Slice(blks, tipsetSortFunc(blks))
var ts TipSet