diff options
Diffstat (limited to 'src/encoding/gob/decode.go')
| -rw-r--r-- | src/encoding/gob/decode.go | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/src/encoding/gob/decode.go b/src/encoding/gob/decode.go index d2f6c749b1..0e0ec75ccc 100644 --- a/src/encoding/gob/decode.go +++ b/src/encoding/gob/decode.go @@ -871,8 +871,13 @@ func (dec *Decoder) decOpFor(wireId typeId, rt reflect.Type, name string, inProg return &op } +var maxIgnoreNestingDepth = 10000 + // decIgnoreOpFor returns the decoding op for a field that has no destination. -func (dec *Decoder) decIgnoreOpFor(wireId typeId, inProgress map[typeId]*decOp) *decOp { +func (dec *Decoder) decIgnoreOpFor(wireId typeId, inProgress map[typeId]*decOp, depth int) *decOp { + if depth > maxIgnoreNestingDepth { + error_(errors.New("invalid nesting depth")) + } // If this type is already in progress, it's a recursive type (e.g. map[string]*T). // Return the pointer to the op we're already building. if opPtr := inProgress[wireId]; opPtr != nil { @@ -896,7 +901,7 @@ func (dec *Decoder) decIgnoreOpFor(wireId typeId, inProgress map[typeId]*decOp) errorf("bad data: undefined type %s", wireId.string()) case wire.ArrayT != nil: elemId := wire.ArrayT.Elem - elemOp := dec.decIgnoreOpFor(elemId, inProgress) + elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1) op = func(i *decInstr, state *decoderState, value reflect.Value) { state.dec.ignoreArray(state, *elemOp, wire.ArrayT.Len) } @@ -904,15 +909,15 @@ func (dec *Decoder) decIgnoreOpFor(wireId typeId, inProgress map[typeId]*decOp) case wire.MapT != nil: keyId := dec.wireType[wireId].MapT.Key elemId := dec.wireType[wireId].MapT.Elem - keyOp := dec.decIgnoreOpFor(keyId, inProgress) - elemOp := dec.decIgnoreOpFor(elemId, inProgress) + keyOp := dec.decIgnoreOpFor(keyId, inProgress, depth+1) + elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1) op = func(i *decInstr, state *decoderState, value reflect.Value) { state.dec.ignoreMap(state, *keyOp, *elemOp) } case wire.SliceT != nil: elemId := wire.SliceT.Elem - elemOp := dec.decIgnoreOpFor(elemId, inProgress) + elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1) op = func(i *decInstr, state *decoderState, value reflect.Value) { state.dec.ignoreSlice(state, *elemOp) } @@ -1073,7 +1078,7 @@ func (dec *Decoder) compileSingle(remoteId typeId, ut *userTypeInfo) (engine *de func (dec *Decoder) compileIgnoreSingle(remoteId typeId) *decEngine { engine := new(decEngine) engine.instr = make([]decInstr, 1) // one item - op := dec.decIgnoreOpFor(remoteId, make(map[typeId]*decOp)) + op := dec.decIgnoreOpFor(remoteId, make(map[typeId]*decOp), 0) ovfl := overflow(dec.typeString(remoteId)) engine.instr[0] = decInstr{*op, 0, nil, ovfl} engine.numInstr = 1 @@ -1118,7 +1123,7 @@ func (dec *Decoder) compileDec(remoteId typeId, ut *userTypeInfo) (engine *decEn localField, present := srt.FieldByName(wireField.Name) // TODO(r): anonymous names if !present || !isExported(wireField.Name) { - op := dec.decIgnoreOpFor(wireField.Id, make(map[typeId]*decOp)) + op := dec.decIgnoreOpFor(wireField.Id, make(map[typeId]*decOp), 0) engine.instr[fieldnum] = decInstr{*op, fieldnum, nil, ovfl} continue } |