[misc] add arbitrary buffer allocation to GetResource()

* If duplicate is TRUE and len is non-zero, then a buffer of len size,
  padded with zeroes, is allocated for the resource.

src/dos.c

@@ -2,7 +2,7 @@
  * Rufus: The Reliable USB Formatting Utility
  * DOS boot file extraction, from the FAT12 floppy image in diskcopy.dll
  * (MS WinME DOS) or from the embedded FreeDOS resource files
- * Copyright © 2011-2017 Pete Batard <pete@akeo.ie>
+ * Copyright © 2011-2020 Pete Batard <pete@akeo.ie>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -317,6 +317,7 @@ static BOOL ExtractMSDOS(const char* path)
 		goto out;
 	}
 
+	DiskImageSize = 0;
 	DiskImage = (BYTE*)GetResource(hDLL, MAKEINTRESOURCEA(1), "BINFILE", "disk image", &DiskImageSize, TRUE);
 	if (DiskImage == NULL)
 		goto out;

src/rufus.c

@@ -1633,6 +1633,7 @@ static void InitDialog(HWND hDlg)
 	uprintf(APPLICATION_NAME " " APPLICATION_ARCH " v%d.%d.%d%s%s", rufus_version[0], rufus_version[1], rufus_version[2],
 		IsAlphaOrBeta(), (ini_file != NULL)?"(Portable)":"");
 	for (i=0; i<ARRAYSIZE(resource); i++) {
+		len = 0;
 		buf = (char*)GetResource(hMainInstance, resource[i], _RT_RCDATA, "ldlinux_sys", &len, TRUE);
 		if (buf == NULL) {
 			uprintf("Warning: could not read embedded Syslinux v%d version", i+4);

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 232, 326
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 3.9.1616"
+CAPTION "Rufus 3.9.1617"
 FONT 9, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
@@ -394,8 +394,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 3,9,1616,0
+ FILEVERSION 3,9,1617,0
- PRODUCTVERSION 3,9,1616,0
+ PRODUCTVERSION 3,9,1617,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -413,13 +413,13 @@ BEGIN
             VALUE "Comments", "https://rufus.ie"
             VALUE "CompanyName", "Akeo Consulting"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "3.9.1616"
+            VALUE "FileVersion", "3.9.1617"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2020 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
             VALUE "OriginalFilename", "rufus-3.9.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "3.9.1616"
+            VALUE "ProductVersion", "3.9.1617"
         END
     END
     BLOCK "VarFileInfo"

src/stdfn.c

@@ -549,10 +549,17 @@ out:
 	return ret;
 }
 
+/*
+ * Get a resource from the RC. If needed that resource can be duplicated.
+ * If duplicate is true and len is non-zero, the a zeroed buffer of 'len'
+ * size is allocated for the resource. Else the buffer is allocate for
+ * the resource size.
+ */
 unsigned char* GetResource(HMODULE module, char* name, char* type, const char* desc, DWORD* len, BOOL duplicate)
 {
 	HGLOBAL res_handle;
 	HRSRC res;
+	DWORD res_len;
 	unsigned char* p = NULL;
 
 	res = FindResourceA(module, name, type);
@@ -565,18 +572,23 @@ unsigned char* GetResource(HMODULE module, char* name, char* type, const char* d
 		uprintf("Could not load resource '%s': %s\n", desc, WindowsErrorString());
 		goto out;
 	}
-	*len = SizeofResource(module, res);
+	res_len = SizeofResource(module, res);
 
 	if (duplicate) {
-		p = (unsigned char*)malloc(*len);
+		if (*len == 0)
+			*len = res_len;
+		p = (unsigned char*)calloc(*len, 1);
 		if (p == NULL) {
-			uprintf("Coult not allocate resource '%s'\n", desc);
+			uprintf("Could not allocate resource '%s'\n", desc);
 			goto out;
 		}
-		memcpy(p, LockResource(res_handle), *len);
+		memcpy(p, LockResource(res_handle), res_len);
+		if (res_len < *len)
+			uprintf("Warning: Resource '%s' was truncated by %d bytes!\n", desc, *len - res_len);
 	} else {
 		p = (unsigned char*)LockResource(res_handle);
 	}
+	*len = res_len;
 
 out:
 	return p;

src/stdlg.c

@@ -1856,7 +1856,7 @@ LPCDLGTEMPLATE GetDialogTemplate(int Dialog_ID)
 	int i;
 	const char thai_id[] = "th-TH";
 	size_t len;
-	DWORD size;
+	DWORD size = 0;
 	DWORD* dwBuf;
 	WCHAR* wBuf;
 	LPCDLGTEMPLATE rcTemplate = (LPCDLGTEMPLATE) GetResource(hMainInstance, MAKEINTRESOURCEA(Dialog_ID),

src/syslinux.c

@@ -2,7 +2,7 @@
  *
  *   Copyright 2003 Lars Munch Christensen - All Rights Reserved
  *   Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
- *   Copyright 2012-2018 Pete Batard
+ *   Copyright 2012-2020 Pete Batard
  *
  *   Based on the Linux installer program for SYSLINUX by H. Peter Anvin
  *
@@ -185,6 +185,7 @@ BOOL InstallSyslinux(DWORD drive_index, char drive_letter, int file_system)
 	} else {
 		for (i=0; i<2; i++) {
 		static_sprintf(tmp, "%s.%s", ldlinux, ldlinux_ext[i]);
+		syslinux_ldlinux_len[i] = 0;
 		syslinux_ldlinux[i] = GetResource(hMainInstance, resource[use_v5?1:0][i],
 			_RT_RCDATA, tmp, &syslinux_ldlinux_len[i], TRUE);
 		if (syslinux_ldlinux[i] == NULL)