diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
index a09d97679de..0ac4d60d070 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
@@ -7276,4 +7276,17 @@ public class AST2Tests extends AST2BaseTest {
 		parseAndCheckBindings(code, ParserLanguage.C, true);
 		parseAndCheckBindings(code, ParserLanguage.CPP, true);
 	}
+	
+	//	void func(int* obj) {
+	//	    int* obj = 0;
+	//	}
+	public void testParameterRedeclaration_301779() throws Exception {
+        final String code = getAboveComment();
+        BindingAssertionHelper bh= new BindingAssertionHelper(code, true);
+        bh.assertNonProblem("obj", 3, IParameter.class);
+        bh.assertProblem("obj =", 3);
+        bh= new BindingAssertionHelper(code, false);
+        bh.assertNonProblem("obj", 3, IParameter.class);
+        bh.assertProblem("obj =", 3);
+	}
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPParameter.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPParameter.java
index 599e7495cfe..e4de53cd6f9 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPParameter.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPParameter.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2004, 2009 IBM Corporation and others.
+ * Copyright (c) 2004, 2010 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -27,8 +27,8 @@ import org.eclipse.cdt.core.dom.ast.IScope;
 import org.eclipse.cdt.core.dom.ast.IType;
 import org.eclipse.cdt.core.dom.ast.IValue;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTParameterDeclaration;
-import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameterPackType;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameter;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameterPackType;
 import org.eclipse.cdt.core.parser.util.ArrayUtil;
 import org.eclipse.cdt.core.parser.util.CharArrayUtils;
 import org.eclipse.cdt.internal.core.dom.Linkage;
@@ -272,11 +272,13 @@ public class CPPParameter extends PlatformObject implements ICPPParameter, ICPPI
 
 		for (int i = 0; i < ns.length && ns[i] != null; i++) {
 			IASTNode parent = ns[i].getParent();
-			while (!(parent instanceof IASTParameterDeclaration))
+			while (parent != null && !(parent instanceof IASTParameterDeclaration))
 				parent = parent.getParent();
-			IASTDeclSpecifier declSpec = ((IASTParameterDeclaration) parent).getDeclSpecifier();
-			if (declSpec.getStorageClass() == storage)
-				return true;
+			if (parent != null) {
+				IASTDeclSpecifier declSpec = ((IASTParameterDeclaration) parent).getDeclSpecifier();
+				if (declSpec.getStorageClass() == storage)
+					return true;
+			}
 		}
 		return false;
 	}
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPVisitor.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPVisitor.java
index 35e9eb8beb7..bdc3b98b0ce 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPVisitor.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPVisitor.java
@@ -610,7 +610,7 @@ public class CPPVisitor extends ASTQueries {
         } else if (parent instanceof IASTSimpleDeclaration) {
         	IASTSimpleDeclaration simpleDecl = (IASTSimpleDeclaration) parent;
         	if (simpleDecl.getDeclSpecifier().getStorageClass() == IASTDeclSpecifier.sc_typedef) {
-        		// typedef declaration
+        		// Typedef declaration
         		if (binding instanceof ICPPInternalBinding && binding instanceof ITypedef && name.isActive()) {
         			IType t1 = ((ITypedef) binding).getType();
         			IType t2 = createType(declarator);
@@ -620,23 +620,26 @@ public class CPPVisitor extends ASTQueries {
         			}
         			return new ProblemBinding(name, IProblemBinding.SEMANTIC_INVALID_REDECLARATION);
         		}
-        		// if we don't resolve the target type first, we get a problem binding in case the typedef
+        		// If we don't resolve the target type first, we get a problem binding in case the typedef
         		// redeclares the target type, otherwise it is safer to defer the resolution of the target type.
         		IType targetType= createType(declarator);
         		CPPTypedef td= new CPPTypedef(name);
         		td.setType(targetType);
         		binding = td;
         	} else if (typeRelevantDtor instanceof IASTFunctionDeclarator) {
-        		// function declaration
+        		// Function declaration via function declarator
     			isFunction= true;
     		} else {
-        		// looks like a variable declaration
+        		// Looks like a variable declaration
         	    IType t1 = createType(declarator);
         	    if (SemanticUtil.getNestedType(t1, TDEF) instanceof IFunctionType) {
-        	    	// function declaration with typedef
+        	    	// Function declaration via a typedef for a function type
         	    	isFunction= true;
+        	    } else if (binding instanceof IParameter) {
+        	    	// Variable declaration redeclaring a parameter
+        	    	binding = new ProblemBinding(name, IProblemBinding.SEMANTIC_INVALID_REDECLARATION);
         	    } else {
-        	    	// variable declaration
+        	    	// Variable declaration
         	    	IType t2= null;
         	    	if (binding != null && binding instanceof IVariable && !(binding instanceof IIndexBinding)) {
         	    		try {