triedb/pathdb: check result

Author: jsvisa

triedb/pathdb/history_trienode.go

@@ -387,10 +387,19 @@ func decodeSingle(keySection []byte, onValue func([]byte, int, int) error) ([]st
 		}
 		// Resolve the entry from key section
 		nShared, nn := binary.Uvarint(keySection[keyOff:]) // key length shared (varint)
+		if nn <= 0 {
+			return nil, fmt.Errorf("corrupted varint encoding for nShared at offset %d", keyOff)
+		}
 		keyOff += nn
 		nUnshared, nn := binary.Uvarint(keySection[keyOff:]) // key length not shared (varint)
+		if nn <= 0 {
+			return nil, fmt.Errorf("corrupted varint encoding for nUnshared at offset %d", keyOff)
+		}
 		keyOff += nn
 		nValue, nn := binary.Uvarint(keySection[keyOff:]) // value length (varint)
+		if nn <= 0 {
+			return nil, fmt.Errorf("corrupted varint encoding for nValue at offset %d", keyOff)
+		}
 		keyOff += nn
 
 		// Validate that the values can fit in an int to prevent overflow on 32-bit systems