[Matter.framework] Prevent a leak when using the _subscriptionPoolWor… (

#35978)

src/darwin/Framework/CHIP/MTRDevice_Concrete.mm

@@ -757,7 +757,9 @@ - (void)_ensureSubscriptionForExistingDelegates:(NSString *)reason
  }
  if ([self _deviceUsesThread]) {
  MTR_LOG(" => %@ - device is a thread device, scheduling in pool", self);
+ mtr_weakify(self);
  [self _scheduleSubscriptionPoolWork:^{
+ mtr_strongify(self);
  [self->_deviceController asyncDispatchToMatterQueue:^{
  std::lock_guard lock(self->_lock);
  [self _setupSubscriptionWithReason:[NSString stringWithFormat:@"%@ and scheduled subscription is happening", reason]];
@@ -1165,10 +1167,13 @@ - (void)_scheduleSubscriptionPoolWork:(dispatch_block_t)workBlock inNanoseconds:
  return;
  }
 
+ mtr_weakify(self);
  dispatch_block_t workBlockToQueue = ^{
+ mtr_strongify(self);
  // In the case where a resubscription triggering event happened and already established, running the work block should result in a no-op
  MTRAsyncWorkItem * workItem = [[MTRAsyncWorkItem alloc] initWithQueue:self.queue];
  [workItem setReadyHandler:^(id _Nonnull context, NSInteger retryCount, MTRAsyncWorkCompletionBlock _Nonnull completion) {
+ mtr_strongify(self);
  MTR_LOG("%@ - work item is ready to attempt pooled subscription", self);
  os_unfair_lock_lock(&self->_lock);
 #ifdef DEBUG
@@ -1246,7 +1251,9 @@ - (void)_handleResubscriptionNeededWithDelayOnDeviceQueue:(NSNumber *)resubscrip
 
  // Use the existing _triggerResubscribeWithReason mechanism, which does the right checks when
  // this block is run -- if other triggering events had happened, this would become a no-op.
+ mtr_weakify(self);
  auto resubscriptionBlock = ^{
+ mtr_strongify(self);
  [self->_deviceController asyncDispatchToMatterQueue:^{
  [self _triggerResubscribeWithReason:@"ResubscriptionNeeded timer fired" nodeLikelyReachable:NO];
  } errorHandler:^(NSError * _Nonnull error) {
@@ -1357,7 +1364,9 @@ - (void)_doHandleSubscriptionReset:(NSNumber * _Nullable)retryDelay
 
  // Call _reattemptSubscriptionNowIfNeededWithReason when timer fires - if subscription is
  // in a better state at that time this will be a no-op.
+ mtr_weakify(self);
  auto resubscriptionBlock = ^{
+ mtr_strongify(self);
  [self->_deviceController asyncDispatchToMatterQueue:^{
  std::lock_guard lock(self->_lock);
  [self _reattemptSubscriptionNowIfNeededWithReason:@"got subscription reset"];