Index: except.c
===================================================================
--- except.c	(revision 19876)
+++ except.c	(working copy)
@@ -192,6 +192,12 @@
 
 	    assert (top->except_type == XCEPT_CATCHER);
 	    except_free(catcher->except_obj.except_dyndata);
+	    /* make sure no else can free this pointer again 
+	       See http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1001
+	           http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1202
+	           http://bugs.gentoo.org/show_bug.cgi?id=133092
+	           http://bugs.gentoo.org/show_bug.cgi?id=145974 */
+	    catcher->except_obj.except_dyndata = NULL;
 
 	    for (i = 0; i < catcher->except_size; pi++, i++) {
 		if (match(&except->except_id, pi)) {