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encoding/json: fix UnmarshalTypeError without field and struct values #26719

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encoding/json: fix UnmarshalTypeError without field and struct values #26719

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6 changes: 3 additions & 3 deletions src/encoding/json/decode.go
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Original file line number Diff line number Diff line change
Expand Up @@ -670,6 +670,7 @@ func (d *decodeState) object(v reflect.Value) error {
}

var mapElem reflect.Value
originalErrorContext := d.errorContext

for {
// Read opening " of string key or closing }.
Expand Down Expand Up @@ -829,8 +830,7 @@ func (d *decodeState) object(v reflect.Value) error {
return errPhase
}

d.errorContext.Struct = nil
d.errorContext.Field = ""
d.errorContext = originalErrorContext
}
return nil
}
Expand Down Expand Up @@ -988,7 +988,7 @@ func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool
if fromQuoted {
return fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type())
}
return &UnmarshalTypeError{Value: "number", Type: v.Type(), Offset: int64(d.readIndex())}
d.saveError(&UnmarshalTypeError{Value: "number", Type: v.Type(), Offset: int64(d.readIndex())})
case reflect.Interface:
n, err := d.convertNumber(s)
if err != nil {
Expand Down
17 changes: 17 additions & 0 deletions src/encoding/json/decode_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -371,6 +371,10 @@ func (b *intWithPtrMarshalText) UnmarshalText(data []byte) error {
return (*intWithMarshalText)(b).UnmarshalText(data)
}

type mapStringToStringData struct {
Data map[string]string `json:"data"`
}

type unmarshalTest struct {
in string
ptr interface{}
Expand Down Expand Up @@ -401,6 +405,7 @@ var unmarshalTests = []unmarshalTest{
{in: `"invalid: \uD834x\uDD1E"`, ptr: new(string), out: "invalid: \uFFFDx\uFFFD"},
{in: "null", ptr: new(interface{}), out: nil},
{in: `{"X": [1,2,3], "Y": 4}`, ptr: new(T), out: T{Y: 4}, err: &UnmarshalTypeError{"array", reflect.TypeOf(""), 7, "T", "X"}},
{in: `{"X": 23}`, ptr: new(T), out: T{}, err: &UnmarshalTypeError{"number", reflect.TypeOf(""), 8, "T", "X"}}, {in: `{"x": 1}`, ptr: new(tx), out: tx{}},
{in: `{"x": 1}`, ptr: new(tx), out: tx{}},
{in: `{"x": 1}`, ptr: new(tx), err: fmt.Errorf("json: unknown field \"x\""), disallowUnknownFields: true},
{in: `{"F1":1,"F2":2,"F3":3}`, ptr: new(V), out: V{F1: float64(1), F2: int32(2), F3: Number("3")}},
Expand Down Expand Up @@ -866,6 +871,18 @@ var unmarshalTests = []unmarshalTest{
err: fmt.Errorf("json: unknown field \"extra\""),
disallowUnknownFields: true,
},
// issue 26444
// UnmarshalTypeError without field & struct values
{
in: `{"data":{"test1": "bob", "test2": 123}}`,
ptr: new(mapStringToStringData),
err: &UnmarshalTypeError{Value: "number", Type: reflect.TypeOf(""), Offset: 37, Struct: "mapStringToStringData", Field: "data"},
},
{
in: `{"data":{"test1": 123, "test2": "bob"}}`,
ptr: new(mapStringToStringData),
err: &UnmarshalTypeError{Value: "number", Type: reflect.TypeOf(""), Offset: 21, Struct: "mapStringToStringData", Field: "data"},
},
}

func TestMarshal(t *testing.T) {
Expand Down