Fixed a memory reference bug which caused unexplained {badarg, Int} exits.

You could get a reference to another applications memory, if wx had
deleted that applications memory without the drivers knowledge about
it, typically memory allocated by wx and not the application using
classes where wx-driver can't override the desctructors.

When wx allocated new memory and got a pointer to that memory, the
wx-driver detected the same pointer and forwarded the old ref to
erlang.

1 files changed, 32 insertions, 25 deletions

diff --git a/lib/wx/c_src/wxe_impl.cpp b/lib/wx/c_src/wxe_impl.cpp
index d115bb2243..4486dff63b 100644
--- a/lib/wx/c_src/wxe_impl.cpp
+++ b/lib/wx/c_src/wxe_impl.cpp
@@ -1,19 +1,19 @@
 /*
  * %CopyrightBegin%
- * 
- * Copyright Ericsson AB 2008-2009. All Rights Reserved.
- * 
+ *
+ * Copyright Ericsson AB 2008-2010. All Rights Reserved.
+ *
  * The contents of this file are subject to the Erlang Public License,
  * Version 1.1, (the "License"); you may not use this file except in
  * compliance with the License. You should have received a copy of the
  * Erlang Public License along with this software. If not, it can be
  * retrieved online at http://www.erlang.org/.
- * 
+ *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  * the License for the specific language governing rights and limitations
  * under the License.
- * 
+ *
  * %CopyrightEnd% 
  */
 
@@ -615,28 +615,33 @@ int WxeApp::getRef(void * ptr, wxeMemEnv *memenv) {
   ptrMap::iterator it = ptr2ref.find(ptr);
   if(it != ptr2ref.end()) {
     wxeRefData *refd = it->second;
-    return refd->ref;
-  } else { // New Ptr
-    int ref;
-    intList free = memenv->free;
-    
-    if(free.IsEmpty()) {
-      ref = memenv->next++;
-    } else {
-      ref = free.Pop();
-    };
-    if(ref >= memenv->max) {
-      memenv->max *= 2;
-      memenv->ref2ptr = 
-	(void **) driver_realloc(memenv->ref2ptr,memenv->max * sizeof(void*));
-    }
+    if(refd->memenv == memenv) {
+      // Found it return
+      return refd->ref;
+    } // else
+    // Old reference to deleted object, release old and recreate in current memenv.
+    clearPtr(ptr);
+  }
+  int ref;
+  intList free = memenv->free;
 
-    memenv->ref2ptr[ref] = ptr;
-    ptr2ref[ptr] = new wxeRefData(ref, 0, false, memenv);
-    return ref;
+  if(free.IsEmpty()) {
+    ref = memenv->next++;
+  } else {
+    ref = free.Pop();
+  };
+  if(ref >= memenv->max) {
+    memenv->max *= 2;
+    memenv->ref2ptr =
+      (void **) driver_realloc(memenv->ref2ptr,memenv->max * sizeof(void*));
   }
+
+  memenv->ref2ptr[ref] = ptr;
+  ptr2ref[ptr] = new wxeRefData(ref, 0, false, memenv);
+  return ref;
 }
 
+
 void WxeApp::clearPtr(void * ptr) {
   ptrMap::iterator it;
   it = ptr2ref.find(ptr);
@@ -697,13 +702,15 @@ void WxeApp::clearPtr(void * ptr) {
 
 void * WxeApp::getPtr(char * bp, wxeMemEnv *memenv) {
   int index = *(int *) bp;
-  if(!memenv) 
+  if(!memenv) {
     throw wxe_badarg(index);
+  }
   void * temp = memenv->ref2ptr[index];
   if((index < memenv->next) && ((index == 0) || (temp > NULL)))
     return temp;
-  else 
+  else {
     throw wxe_badarg(index);
+  }
 }
 
 void WxeApp::registerPid(char * bp, ErlDrvTermData pid, wxeMemEnv * memenv) {