Fix decodeSlice to check input type before calling its Len method
diff --git a/mapstructure.go b/mapstructure.go
index 0c23d8b..62fe1be 100644
--- a/mapstructure.go
+++ b/mapstructure.go
@@ -470,16 +470,13 @@
dataValKind := dataVal.Kind()
valType := val.Type()
valElemType := valType.Elem()
-
- // Make a new slice to hold our result, same size as the original data.
sliceType := reflect.SliceOf(valElemType)
- valSlice := reflect.MakeSlice(sliceType, dataVal.Len(), dataVal.Len())
// Check input type
if dataValKind != reflect.Array && dataValKind != reflect.Slice {
// Accept empty map instead of array/slice in weakly typed mode
if d.config.WeaklyTypedInput && dataVal.Kind() == reflect.Map && dataVal.Len() == 0 {
- val.Set(valSlice)
+ val.Set(reflect.MakeSlice(sliceType, 0, 0))
return nil
} else {
return fmt.Errorf(
@@ -487,6 +484,9 @@
}
}
+ // Make a new slice to hold our result, same size as the original data.
+ valSlice := reflect.MakeSlice(sliceType, dataVal.Len(), dataVal.Len())
+
// Accumulate any errors
errors := make([]string, 0)
diff --git a/mapstructure_test.go b/mapstructure_test.go
index e82d508..3147f55 100644
--- a/mapstructure_test.go
+++ b/mapstructure_test.go
@@ -593,6 +593,21 @@
testSliceInput(t, inputStringSlicePointer, outputStringSlice)
}
+func TestInvalidSlice(t *testing.T) {
+ t.Parallel()
+
+ input := map[string]interface{}{
+ "vfoo": "foo",
+ "vbar": 42,
+ }
+
+ result := Slice{}
+ err := Decode(input, &result)
+ if err == nil {
+ t.Errorf("expected failure")
+ }
+}
+
func TestSliceOfStruct(t *testing.T) {
t.Parallel()
