Fix a memory leak

Author: nekoppai

Makefile

@@ -1,6 +1,6 @@
 OPT=-Os -Wall
-CFLAGS=-fno-ident -fno-stack-check -fno-stack-protector
-LDFLAGS=-L. -nostartfiles -nostdlib -lucrt -luser32 -lkernel32 -Wl,--exclude-all-symbols,--enable-stdcall-fixup,--dynamicbase,--nxcompat,--subsystem,windows:6.0
+CFLAGS=-fno-ident
+LDFLAGS=-L. -nostartfiles -nostdlib -lkernel32 -lshlwapi -Wl,--exclude-all-symbols,--enable-stdcall-fixup,--dynamicbase,--nxcompat,--subsystem,windows:6.0
 
 PREFIX32=C:/mingw32/bin/
 PREFIX64=C:/mingw64/bin/

sppc.c

@@ -1,5 +1,6 @@
 #define _WIN32_WINNT _WIN32_WINNT_WIN10
 #include <windows.h>
+#include <shlwapi.h>
 
 typedef GUID SLID;
 typedef void *HSLC;
@@ -49,27 +50,20 @@ BOOL APIENTRY WINAPI dll_main(
 }
 
 BOOL check_for_grace(HSLC hSLC, SLID *pProductSkuId) {
-    PBYTE *pBuffer = malloc(4096);
-    UINT cbSize = 4096;
+    PBYTE pBuffer = 0;
+    UINT cbSize = 0;
 
-    if(SLGetProductSkuInformation(
-        hSLC,
-        pProductSkuId,
-        L"Name",
-        NULL,
-        &cbSize,
-        pBuffer
-    ) != S_OK) {
-        free(pBuffer);
+    if(SLGetProductSkuInformation(hSLC, pProductSkuId, L"Name", NULL, &cbSize, &pBuffer) != S_OK) {
+        LocalFree(pBuffer);
         return FALSE;
     }
 
-    if(wcsstr((PWSTR)*pBuffer, L"Grace") != NULL) {
-        free(pBuffer);
+    if(StrStrNIW((PWSTR)pBuffer, L"Grace", cbSize) != NULL) {
+        LocalFree(pBuffer);
         return TRUE;
     }
 
-	free(pBuffer);
+    LocalFree(pBuffer);
     return FALSE;
 }
 

sppc.rc

@@ -1,6 +1,6 @@
 1 VERSIONINFO
-FILEVERSION    0,2,0,0
-PRODUCTVERSION 0,2,0,0
+FILEVERSION    0,3,0,0
+PRODUCTVERSION 0,3,0,0
 FILEOS 0x40004L
 FILETYPE 0x2L
 BEGIN
@@ -10,12 +10,12 @@ BEGIN
         BEGIN
             VALUE "CompanyName",      "Anomalous Software Deterioration Corporation"
             VALUE "FileDescription",  "ohook SPPC"
-            VALUE "FileVersion",      "0.2.0.0"
+            VALUE "FileVersion",      "0.3.0.0"
             VALUE "InternalName",     "sppc"
             VALUE "LegalCopyright",   "© 2023 Anomalous Software Deterioration Corporation"
             VALUE "OriginalFilename", "sppc.dll"
             VALUE "ProductName",      "ohook"
-            VALUE "ProductVersion",   "0.2.0.0"
+            VALUE "ProductVersion",   "0.3.0.0"
         END
     END
 

sppcs32.def

@@ -1,4 +1,4 @@
 LIBRARY sppcs.dll
 EXPORTS
 SLGetLicensingStatusInformation@24
-SLGetProductSkuInformation@24
+SLGetProductSkuInformation@24