ews: add missing nullptr check to exmdb_client::read_message callsites

Fixes: gromox-2.9-76-ga603aeb8e
Fixes: gromox-2.11-40-gd7dd56327

Author: jengelh

exch/ews/context.cpp

@@ -1032,8 +1032,9 @@ void EWSContext::loadSpecial(const std::string& dir, uint64_t fid, uint64_t mid,
 	auto& exmdb = m_plugin.exmdb;
 	if(special & sShape::MimeContent)
 	{
-		MESSAGE_CONTENT* content;
-		if(!exmdb.read_message(dir.c_str(), nullptr, CP_ACP, mid, &content))
+		MESSAGE_CONTENT *content = nullptr;
+		if (!exmdb.read_message(dir.c_str(), nullptr, CP_ACP, mid, &content) ||
+		    content == nullptr)
 			throw EWSError::ItemNotFound(E3071);
 		MAIL mail;
 		auto getPropIds = [&](const PROPNAME_ARRAY* names, PROPID_ARRAY* ids)

exch/ews/requests.cpp

@@ -1452,8 +1452,10 @@ void process(mSendItemRequest&& request, XMLElement* response, const EWSContext&
 		if(!(ctx.permissions(dir, folder.folderId) & frightsReadAny))
 			throw EWSError::AccessDenied(E3142);
 
-		MESSAGE_CONTENT* content;
-		if(!ctx.plugin().exmdb.read_message(dir.c_str(), ctx.effectiveUser(folder), CP_ACP, meid.messageId(), &content))
+		MESSAGE_CONTENT *content = nullptr;
+		if (!ctx.plugin().exmdb.read_message(dir.c_str(),
+		    ctx.effectiveUser(folder), CP_ACP, meid.messageId(),
+		    &content) || content == nullptr)
 			throw EWSError::ItemNotFound(E3143);
 		ctx.send(dir, *content);