[PATCH libXt] Fix possible NULL access

[walter harms]

Fix possible NULL access

Signed-off-by: walter harms <wharms at bfs.de>
---
 src/Resources.c |    3 +++
 src/TMparse.c   |   18 ++++++++++++++----
 src/TMstate.c   |   11 +++++++----
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/src/Resources.c b/src/Resources.c
index 1cb37d4..9230169 100644
--- a/src/Resources.c
+++ b/src/Resources.c
@@ -967,8 +967,11 @@ static XtCacheRef *GetResources(
 		if (cache_ptr && *cache_ptr)
 		    cache_ptr++;
 	    } else {
+	      // value.addr can be NULL see: !already_copied
+	      if (value.addr)
 		*((XtTranslations *)&widget->core.tm.current_state) =
 		    *((XtTranslations *)value.addr);
+	
 	    }
 	}
     }
diff --git a/src/TMparse.c b/src/TMparse.c
index 5fddb82..5930187 100644
--- a/src/TMparse.c
+++ b/src/TMparse.c
@@ -1288,10 +1288,15 @@ static void RepeatDownPlus(
 	*event = timerEventRec;

     }
-
+    /*
+      if reps==0 -> lastDownEvent == NULL
+    */
     event->next = lastDownEvent;
     *eventP = event;
-    *actionsP = &lastDownEvent->actions;
+    if (lastDownEvent)
+      *actionsP = &lastDownEvent->actions;
+    else
+      *actionsP = NULL ;
 }

 static void RepeatUp(
@@ -1395,10 +1400,15 @@ static void RepeatUpPlus(
 	*event = *downEvent;

 	}
-
+    /*
+      if reps==0 -> lastUpEvent == NULL
+    */
     event->next = lastUpEvent;
     *eventP = event;
-    *actionsP = &lastUpEvent->actions;
+    if (lastUpEvent)
+      *actionsP = &lastUpEvent->actions;
+    else
+      *actionsP = NULL ;
 }

 static void RepeatOther(
diff --git a/src/TMstate.c b/src/TMstate.c
index 4a634b4..843292c 100644
--- a/src/TMstate.c
+++ b/src/TMstate.c
@@ -717,10 +717,13 @@ static void PushContext(
 		  XtRealloc((char *)context->matches,
 			    context->maxMatches * sizeof(MatchPairRec));
 	    }
-	  context->matches[context->numMatches].isCycleStart = newState->isCycleStart;
-	  context->matches[context->numMatches].isCycleEnd = newState->isCycleEnd;
-	  context->matches[context->numMatches].typeIndex = newState->typeIndex;
-	  context->matches[context->numMatches++].modIndex = newState->modIndex;
+	  if ( context->matches )
+	    {
+	      context->matches[context->numMatches].isCycleStart = newState->isCycleStart;
+	      context->matches[context->numMatches].isCycleEnd = newState->isCycleEnd;
+	      context->matches[context->numMatches].typeIndex = newState->typeIndex;
+	      context->matches[context->numMatches++].modIndex = newState->modIndex;
+	    }
 	  *contextPtr = context;
       }
       UNLOCK_PROCESS;
-- 
1.6.0.2