Address several remaining 1.8.9.8373 crashes reported on

indra/llrender/llvertexbuffer.cpp

@@ -1197,6 +1197,10 @@ void LLVertexBuffer::genBuffer(U32 size)
 	{
 		mMappedData = sDynamicVBOPool.allocate(mGLBuffer, mSize);
 	}
+	if ((sDisableVBOMapping || mUsage != GL_DYNAMIC_DRAW_ARB) && !mMappedData)
+	{
+		LL_ERRS() << "mMappedData allocation failedd" << LL_ENDL;
+	}
 	
 	sGLCount++;
 }
@@ -1213,6 +1217,10 @@ void LLVertexBuffer::genIndices(U32 size)
 	{
 		mMappedIndexData = sDynamicIBOPool.allocate(mGLIndices, mIndicesSize);
 	}
+	if ((sDisableVBOMapping || mUsage != GL_DYNAMIC_DRAW_ARB) && !mMappedIndexData)
+	{
+		LL_ERRS() << "mMappedIndexData allocation failedd" << LL_ENDL;
+	}
 	
 	sGLCount++;
 }
@@ -1848,6 +1856,7 @@ volatile U8* LLVertexBuffer::mapIndexBuffer(S32 index, S32 count, bool map_range
 			LL_ERRS() << "Attempted to map a specific range of a buffer that was already mapped." << LL_ENDL;
 		}
 
+		bool was_locked = mIndexLocked;
 		if (!mIndexLocked)
 		{
 			mIndexLocked = true;
@@ -1942,6 +1951,10 @@ volatile U8* LLVertexBuffer::mapIndexBuffer(S32 index, S32 count, bool map_range
 
 				LL_ERRS() << "glMapBuffer returned NULL (no index data)" << LL_ENDL;
 			}
+			else if (was_locked)
+			{
+				LL_ERRS() << "mIndexLocked was true but no Index data allocated" << LL_ENDL;
+			}
 			else
 			{
 				LL_ERRS() << "memory allocation for Index data failed. " << LL_ENDL;

indra/newview/llchatbar.cpp

@@ -531,17 +531,24 @@ void LLChatBar::sendChat( EChatType type )
 // static 
 void LLChatBar::startChat(const char* line)
 {
+	if (!gChatBar || !gChatBar->getParent())
+	{
+		return;
+	}
 	gChatBar->getParent()->setVisible(TRUE);
 	gChatBar->setKeyboardFocus(TRUE);
 	gSavedSettings.setBOOL("ChatVisible", TRUE);
 
-	if (line && gChatBar->mInputEditor)
+	if (gChatBar->mInputEditor)
 	{
-		std::string line_string(line);
-		gChatBar->mInputEditor->setText(line_string);
+		if (line)
+		{
+			std::string line_string(line);
+			gChatBar->mInputEditor->setText(line_string);
+		}
+		// always move cursor to end so users don't obliterate chat when accidentally hitting WASD
+		gChatBar->mInputEditor->setCursorToEnd();
 	}
-	// always move cursor to end so users don't obliterate chat when accidentally hitting WASD
-	gChatBar->mInputEditor->setCursorToEnd();
 }
 
 
@@ -550,7 +557,8 @@ void LLChatBar::startChat(const char* line)
 void LLChatBar::stopChat()
 {
 	// In simple UI mode, we never release focus from the chat bar
-	gChatBar->setKeyboardFocus(FALSE);
+	if (gChatBar)
+		gChatBar->setKeyboardFocus(FALSE);
 
 	// If we typed a movement key and pressed return during the
 	// same frame, the keyboard handlers will see the key as having
@@ -562,7 +570,8 @@ void LLChatBar::stopChat()
 	gAgent.stopTyping();
 
 	// hide chat bar so it doesn't grab focus back
-	gChatBar->getParent()->setVisible(FALSE);
+	if (gChatBar && gChatBar->getParent())
+		gChatBar->getParent()->setVisible(FALSE);
 	gSavedSettings.setBOOL("ChatVisible", FALSE);
 }
 

indra/newview/llcloud.cpp

@@ -515,6 +515,10 @@ void LLCloudLayer::connectNeighbor(LLCloudLayer *cloudp, U32 direction)
 		return;
 	}
 
+	if (mNeighbors[direction])
+	{
+		mNeighbors[direction]->mNeighbors[gDirOpposite[direction]] = NULL;
+	}
 	mNeighbors[direction] = cloudp;
 	if (cloudp)
 		mNeighbors[direction]->mNeighbors[gDirOpposite[direction]] = this;

indra/newview/llhudicon.cpp

@@ -94,7 +94,7 @@ void LLHUDIcon::renderIcon(BOOL for_select)
 	if (mHidden)
 		return;
 
-	if (mSourceObject.isNull() || mImagep.isNull())
+	if (mSourceObject.isNull() || mImagep.isNull() || mSourceObject->mDrawable.isNull())
 	{
 		markDead();
 		return;

indra/newview/llimprocessing.cpp

@@ -1895,6 +1895,11 @@ void LLIMProcessing::requestOfflineMessages()
 
 void LLIMProcessing::requestOfflineMessagesCoro(const LLCoroResponder& responder)
 {
+	if (LLApp::isQuitting() || !gAgent.getRegion())
+	{
+		return;
+	}
+
     auto status = responder.getStatus();
 
     if (!responder.isGoodStatus(status)) // success = httpResults["success"].asBoolean();

indra/newview/llviewerkeyboard.cpp

@@ -548,24 +548,29 @@ void start_chat( EKeystate s )
 	}
 
 	// start chat
-	gChatBar->startChat(NULL);
+	LLChatBar::startChat(NULL);
 }
 
 void start_gesture( EKeystate s )
 {
+	if (LLAppViewer::instance()->quitRequested())
+	{
+		return; // can't talk, gotta go, kthxbye!
+	}
+
 	LLUICtrl* focus_ctrlp = dynamic_cast<LLUICtrl*>(gFocusMgr.getKeyboardFocus());
 	if (KEYSTATE_UP == s &&
 		! (focus_ctrlp && focus_ctrlp->acceptsTextInput()))
 	{
-		if (gChatBar->getCurrentChat().empty())
+		if (gChatBar && gChatBar->getCurrentChat().empty())
 		{
 			// No existing chat in chat editor, insert '/'
-			gChatBar->startChat("/");
+			LLChatBar::startChat("/");
 		}
 		else
 		{
 			// Don't overwrite existing text in chat editor
-			gChatBar->startChat(NULL);
+			LLChatBar::startChat(NULL);
 		}
 	}
 }

indra/newview/llviewerwindow.cpp

@@ -2946,7 +2946,7 @@ BOOL LLViewerWindow::handleKey(KEY key, MASK mask)
 	{
 		{
 			// passing NULL here, character will be added later when it is handled by character handler.
-			gChatBar->startChat(NULL);
+			LLChatBar::startChat(NULL);
 			return TRUE;
 		}
 	}
@@ -3548,7 +3548,7 @@ void LLViewerWindow::updateLayout()
 		&& gFocusMgr.getKeyboardFocus() == NULL 
 		&& gChatBar->isInVisibleChain())
 	{
-		gChatBar->startChat(NULL);
+		LLChatBar::startChat(NULL);
 	}
 }