diff --git a/ChangeLog b/ChangeLog
index 0688a8bc20..1de5184dda 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Jun 29 18:22:06 2008  Masaki Suketa  <masaki.suketa@nifty.ne.jp>
+
+	* ext/win32ole/win32ole.c(ole_invoke): fix memory leak.
+	  [ruby-bugs-20792]
+
 Sun Jun 29 18:19:11 2008  Akinori MUSHA  <knu@iDaemons.org>
 
 	* eval.c (PUSH_FRAME, PUSH_CLASS): Add volatile to avoid a
diff --git a/ext/win32ole/win32ole.c b/ext/win32ole/win32ole.c
index 07b3ede5eb..7844b41ad4 100644
--- a/ext/win32ole/win32ole.c
+++ b/ext/win32ole/win32ole.c
@@ -79,7 +79,7 @@
 
 #define WC2VSTR(x) ole_wc2vstr((x), TRUE)
 
-#define WIN32OLE_VERSION "0.7.4"
+#define WIN32OLE_VERSION "0.7.5"
 
 typedef HRESULT (STDAPICALLTYPE FNCOCREATEINSTANCEEX)
     (REFCLSID, IUnknown*, DWORD, COSERVERINFO*, DWORD, MULTI_QI*);
@@ -522,6 +522,15 @@ ole_hresult2msg(hr)
     return msg;
 }
 
+static void
+ole_freeexceptinfo(pExInfo)
+    EXCEPINFO *pExInfo;
+{
+    SysFreeString(pExInfo->bstrDescription);
+    SysFreeString(pExInfo->bstrSource);
+    SysFreeString(pExInfo->bstrHelpFile);
+}
+
 static VALUE
 ole_excepinfo2msg(pExInfo)
     EXCEPINFO *pExInfo;
@@ -561,9 +570,7 @@ ole_excepinfo2msg(pExInfo)
     }
     if(pSource) free(pSource);
     if(pDescription) free(pDescription);
-    SysFreeString(pExInfo->bstrDescription);
-    SysFreeString(pExInfo->bstrSource);
-    SysFreeString(pExInfo->bstrHelpFile);
+    ole_freeexceptinfo(pExInfo);
     return error_msg;
 }
 
@@ -2109,6 +2116,9 @@ ole_invoke(argc, argv, self, wFlags)
                 param = rb_ary_entry(paramS, i-cNamedArgs);
                 ole_val2variant(param, &op.dp.rgvarg[n]);
             }
+            if (hr == DISP_E_EXCEPTION) {
+                ole_freeexceptinfo(&excepinfo);
+            }
             memset(&excepinfo, 0, sizeof(EXCEPINFO));
             VariantInit(&result);
             hr = pole->pDispatch->lpVtbl->Invoke(pole->pDispatch, DispID, 
@@ -2121,6 +2131,9 @@ ole_invoke(argc, argv, self, wFlags)
              * hResult == DISP_E_EXCEPTION. this only happens on
              * functions whose DISPID > 0x8000 */
             if ((hr == DISP_E_EXCEPTION || hr == DISP_E_MEMBERNOTFOUND) && DispID > 0x8000) {
+                if (hr == DISP_E_EXCEPTION) {
+                    ole_freeexceptinfo(&excepinfo);
+                }
                 memset(&excepinfo, 0, sizeof(EXCEPINFO));
                 hr = pole->pDispatch->lpVtbl->Invoke(pole->pDispatch, DispID, 
                         &IID_NULL, lcid, wFlags,
@@ -2140,6 +2153,9 @@ ole_invoke(argc, argv, self, wFlags)
                     param = rb_ary_entry(paramS, i-cNamedArgs);
                     ole_val2variant2(param, &op.dp.rgvarg[n]);
                 }
+                if (hr == DISP_E_EXCEPTION) {
+                    ole_freeexceptinfo(&excepinfo);
+                }
                 memset(&excepinfo, 0, sizeof(EXCEPINFO));
                 VariantInit(&result);
                 hr = pole->pDispatch->lpVtbl->Invoke(pole->pDispatch, DispID, 
diff --git a/version.h b/version.h
index 4f29f70f87..aee845186c 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2008-06-29"
 #define RUBY_VERSION_CODE 187
 #define RUBY_RELEASE_CODE 20080629
-#define RUBY_PATCHLEVEL 29
+#define RUBY_PATCHLEVEL 30
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8