types: validate Part#Proof

add ValidateBasic to crypto/merkle/SimpleProof

types/part_set.go

@@ -26,10 +26,13 @@ type Part struct {
 // ValidateBasic performs basic validation.
 func (part *Part) ValidateBasic() error {
 	if part.Index < 0 {
-		return errors.New("Negative Index")
+		return errors.New("negative Index")
 	}
 	if len(part.Bytes) > BlockPartSizeBytes {
-		return fmt.Errorf("Too big (max: %d)", BlockPartSizeBytes)
+		return errors.Errorf("too big: %d bytes, max: %d", len(part.Bytes), BlockPartSizeBytes)
+	}
+	if err := part.Proof.ValidateBasic(); err != nil {
+		return errors.Wrap(err, "wrong Proof")
 	}
 	return nil
 }

types/part_set_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/tendermint/tendermint/crypto/merkle"
 	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
@@ -115,6 +116,13 @@ func TestPartValidateBasic(t *testing.T) {
 		{"Good Part", func(pt *Part) {}, false},
 		{"Negative index", func(pt *Part) { pt.Index = -1 }, true},
 		{"Too big part", func(pt *Part) { pt.Bytes = make([]byte, BlockPartSizeBytes+1) }, true},
+		{"Too big proof", func(pt *Part) {
+			pt.Proof = merkle.SimpleProof{
+				Total:    1,
+				Index:    1,
+				LeafHash: make([]byte, 1024*1024),
+			}
+		}, true},
 	}
 
 	for _, tc := range testCases {