Fix: Freeing LanguagePack with wrong size.

src/fileio.cpp

@@ -1259,7 +1259,7 @@ void SanitizeFilename(char *filename)
  * @return Pointer to new memory containing the loaded data, or \c nullptr if loading failed.
  * @note If \a maxsize less than the length of the file, loading fails.
  */
-std::unique_ptr<char> ReadFileToMem(const std::string &filename, size_t &lenp, size_t maxsize)
+std::unique_ptr<char[]> ReadFileToMem(const std::string &filename, size_t &lenp, size_t maxsize)
 {
 	FILE *in = fopen(filename.c_str(), "rb");
 	if (in == nullptr) return nullptr;
@@ -1271,10 +1271,7 @@ std::unique_ptr<char> ReadFileToMem(const std::string &filename, size_t &lenp, s
 	fseek(in, 0, SEEK_SET);
 	if (len > maxsize) return nullptr;
 
-	/* std::unique_ptr assumes new/delete unless a custom deleter is supplied.
-	 * As we don't want to have to carry that deleter all over the place, use
-	 * new directly to allocate the memory instead of malloc. */
-	std::unique_ptr<char> mem(static_cast<char *>(::operator new(len + 1)));
+	std::unique_ptr<char[]> mem = std::make_unique<char[]>(len + 1);
 
 	mem.get()[len] = 0;
 	if (fread(mem.get(), len, 1, in) != 1) return nullptr;

src/fileio_func.h

@@ -49,7 +49,7 @@ const char *FiosGetScreenshotDir();
 void SanitizeFilename(char *filename);
 void AppendPathSeparator(std::string &buf);
 void DeterminePaths(const char *exe);
-std::unique_ptr<char> ReadFileToMem(const std::string &filename, size_t &lenp, size_t maxsize);
+std::unique_ptr<char[]> ReadFileToMem(const std::string &filename, size_t &lenp, size_t maxsize);
 bool FileExists(const std::string &filename);
 bool ExtractTar(const std::string &tar_filename, Subdirectory subdir);
 

src/strings.cpp

@@ -185,8 +185,16 @@ struct LanguagePack : public LanguagePackHeader {
 	char data[]; // list of strings
 };
 
+struct LanguagePackDeleter {
+	void operator()(LanguagePack *langpack)
+	{
+		/* LanguagePack is in fact reinterpreted char[], we need to reinterpret it back to free it properly. */
+		delete[] reinterpret_cast<char*>(langpack);
+	}
+};
+
 struct LoadedLanguagePack {
-	std::unique_ptr<LanguagePack> langpack;
+	std::unique_ptr<LanguagePack, LanguagePackDeleter> langpack;
 
 	std::vector<char *> offsets;
 
@@ -1713,7 +1721,7 @@ bool ReadLanguagePack(const LanguageMetadata *lang)
 {
 	/* Current language pack */
 	size_t len = 0;
-	std::unique_ptr<LanguagePack> lang_pack(reinterpret_cast<LanguagePack *>(ReadFileToMem(lang->file, len, 1U << 20).release()));
+	std::unique_ptr<LanguagePack, LanguagePackDeleter> lang_pack(reinterpret_cast<LanguagePack *>(ReadFileToMem(lang->file, len, 1U << 20).release()));
 	if (!lang_pack) return false;
 
 	/* End of read data (+ terminating zero added in ReadFileToMem()) */