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explicitly catch attempt to decode into a value - must be a pointer to see the result.

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R=rsc
https://golang.org/cl/163070
This commit is contained in:
Rob Pike 2009-12-01 21:47:00 -08:00
parent f9810f1b12
commit ff3ea68e52
2 changed files with 20 additions and 2 deletions
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7
src/pkg/gob/decoder.go
View File

@ -58,6 +58,13 @@ func (dec *Decoder) recvType(id typeId) {
// The value underlying e must be the correct type for the next // The value underlying e must be the correct type for the next
// data item received. // data item received.
func (dec *Decoder) Decode(e interface{}) os.Error { func (dec *Decoder) Decode(e interface{}) os.Error {
// If e represents a value, the answer won't get back to the
// caller. Make sure it's a pointer.
if _, ok := reflect.Typeof(e).(*reflect.PtrType); !ok {
dec.state.err = os.ErrorString("gob: attempt to decode into a non-pointer");
return dec.state.err;
}
// Make sure we're single-threaded through here. // Make sure we're single-threaded through here.
dec.mutex.Lock(); dec.mutex.Lock();
defer dec.mutex.Unlock(); defer dec.mutex.Unlock();

15
src/pkg/gob/encoder_test.go
View File

@ -9,6 +9,7 @@ import (
"io"; "io";
"os"; "os";
"reflect"; "reflect";
"strings";
"testing"; "testing";
) )
@ -195,7 +196,6 @@ func TestPtrTypeToType(t *testing.T) {
} }
func TestTypeToPtrPtrPtrPtrType(t *testing.T) { func TestTypeToPtrPtrPtrPtrType(t *testing.T) {
// Encode a *T, decode a T
type Type2 struct { type Type2 struct {
a ****float; a ****float;
} }
@ -215,7 +215,6 @@ func TestTypeToPtrPtrPtrPtrType(t *testing.T) {
} }
func TestSlice(t *testing.T) { func TestSlice(t *testing.T) {
// Encode a *T, decode a T
type Type3 struct { type Type3 struct {
a []string; a []string;
} }
@ -225,3 +224,15 @@ func TestSlice(t *testing.T) {
t.Error(err) t.Error(err)
} }
} }
func TestValueError(t *testing.T) {
// Encode a *T, decode a T
type Type4 struct {
a int;
}
t4p := Type4{3}; // note: not a pointer, unlike the other tests.
var t4 Type4;
if err := encAndDec(t4, t4p); err == nil || strings.Index(err.String(), "pointer") <= 0 {
t.Error("expected error; got none or got wrong one")
}
}