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Properly detect failure in receiving plugin NPObjects.

Browse source 
Properly handles NPError reporting and makes sure that, in the case of
failure, it does not return junk for the NPObject.
This commit is contained in:
David Parks 2019-12-06 12:28:18 +01:00 • committed by Roy Tam
commit db34f0e7be
1 changed files with 8 additions and 5 deletions
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13
dom/plugins/ipc/PluginInstanceChild.cpp
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@ -310,9 +310,10 @@ PluginInstanceChild::InternalGetNPObjectForValue(NPNVariable aValue,
switch (aValue) {
case NPNVWindowNPObject:
if (!(actor = mCachedWindowActor)) {
result = NPERR_GENERIC_ERROR;
PPluginScriptableObjectChild* actorProtocol;
CallNPN_GetValue_NPNVWindowNPObject(&actorProtocol, &result);
if (result == NPERR_NO_ERROR) {
if (CallNPN_GetValue_NPNVWindowNPObject(&actorProtocol, &result) &&
result == NPERR_NO_ERROR) {
actor = mCachedWindowActor =
static_cast<PluginScriptableObjectChild*>(actorProtocol);
NS_ASSERTION(actor, "Null actor!");
@ -324,10 +325,10 @@ PluginInstanceChild::InternalGetNPObjectForValue(NPNVariable aValue,
case NPNVPluginElementNPObject:
if (!(actor = mCachedElementActor)) {
result = NPERR_GENERIC_ERROR;
PPluginScriptableObjectChild* actorProtocol;
CallNPN_GetValue_NPNVPluginElementNPObject(&actorProtocol,
&result);
if (result == NPERR_NO_ERROR) {
if (CallNPN_GetValue_NPNVPluginElementNPObject(&actorProtocol, &result) &&
result == NPERR_NO_ERROR) {
actor = mCachedElementActor =
static_cast<PluginScriptableObjectChild*>(actorProtocol);
NS_ASSERTION(actor, "Null actor!");
@ -338,6 +339,7 @@ PluginInstanceChild::InternalGetNPObjectForValue(NPNVariable aValue,
break;
default:
result = NPERR_GENERIC_ERROR;
NS_NOTREACHED("Don't know what to do with this value type!");
}
@ -434,6 +436,7 @@ PluginInstanceChild::NPN_GetValue(NPNVariable aVar,
case NPNVWindowNPObject: // Intentional fall-through
case NPNVPluginElementNPObject: {
NPObject* object;
*((NPObject**)aValue) = nullptr;
NPError result = InternalGetNPObjectForValue(aVar, &object);
if (result == NPERR_NO_ERROR) {
*((NPObject**)aValue) = object;