msi: Return an error from MSI_GetComponentPath if the buffer is too small.

dlls/msi/msi.c

@@ -2865,7 +2865,9 @@ static INSTALLSTATE MSI_GetComponentPath(LPCWSTR szProduct, LPCWSTR szComponent,
     if (state == INSTALLSTATE_LOCAL && !*path)
         state = INSTALLSTATE_NOTUSED;
 
-    msi_strcpy_to_awstring(path, -1, lpPathBuf, pcchBuf);
+    if (msi_strcpy_to_awstring(path, -1, lpPathBuf, pcchBuf) == ERROR_MORE_DATA)
+        state = INSTALLSTATE_MOREDATA;
+
     msi_free(path);
     return state;
 }
@@ -3379,6 +3381,7 @@ static UINT MSI_ProvideQualifiedComponentEx(LPCWSTR szComponent,
     HKEY hkey;
     DWORD sz;
     UINT rc;
+    INSTALLSTATE state;
 
     rc = MSIREG_OpenUserComponentsKey(szComponent, &hkey, FALSE);
     if (rc != ERROR_SUCCESS)
@@ -3393,13 +3396,16 @@ static UINT MSI_ProvideQualifiedComponentEx(LPCWSTR szComponent,
     MsiDecomposeDescriptorW(info, product, feature, component, &sz);
 
     if (!szProduct)
-        rc = MSI_GetComponentPath(product, component, lpPathBuf, pcchPathBuf);
+        state = MSI_GetComponentPath(product, component, lpPathBuf, pcchPathBuf);
     else
-        rc = MSI_GetComponentPath(szProduct, component, lpPathBuf, pcchPathBuf);
+        state = MSI_GetComponentPath(szProduct, component, lpPathBuf, pcchPathBuf);
 
     msi_free( info );
 
-    if (rc != INSTALLSTATE_LOCAL)
+    if (state == INSTALLSTATE_MOREDATA)
+        return ERROR_MORE_DATA;
+
+    if (state != INSTALLSTATE_LOCAL)
         return ERROR_FILE_NOT_FOUND;
 
     return ERROR_SUCCESS;

dlls/msi/tests/msi.c

@@ -3008,6 +3008,13 @@ static void test_MsiGetComponentPath(void)
     create_file("C:\\imapath", "C:\\imapath", 11);
 
     /* file exists */
+    path[0] = 'a';
+    size = 0;
+    state = MsiGetComponentPathA(prodcode, component, path, &size);
+    ok(state == INSTALLSTATE_MOREDATA, "Expected INSTALLSTATE_MOREDATA, got %d\n", state);
+    ok(path[0] == 'a', "got %s\n", path);
+    ok(size == 10, "Expected 10, got %d\n", size);
+
     path[0] = 0;
     size = MAX_PATH;
     state = MsiGetComponentPathA(prodcode, component, path, &size);
@@ -3015,6 +3022,13 @@ static void test_MsiGetComponentPath(void)
     ok(!lstrcmpA(path, "C:\\imapath"), "Expected C:\\imapath, got %s\n", path);
     ok(size == 10, "Expected 10, got %d\n", size);
 
+    size = 0;
+    path[0] = 'a';
+    state = MsiLocateComponentA(component, path, &size);
+    ok(state == INSTALLSTATE_MOREDATA, "Expected INSTALLSTATE_MOREDATA, got %d\n", state);
+    ok(path[0] == 'a', "got %s\n", path);
+    ok(size == 10, "Expected 10, got %d\n", size);
+
     path[0] = 0;
     size = MAX_PATH;
     state = MsiLocateComponentA(component, path, &size);