canStudentUpdateProposal added to WithdrawProposal.
diff --git a/app/soc/modules/gsoc/views/proposal_review.py b/app/soc/modules/gsoc/views/proposal_review.py
index 591a452..767df31 100644
--- a/app/soc/modules/gsoc/views/proposal_review.py
+++ b/app/soc/modules/gsoc/views/proposal_review.py
@@ -1065,6 +1065,7 @@
   def checkAccess(self):
     self.mutator.proposalFromKwargs()
     self.check.isProposer()
+    self.check.canStudentUpdateProposal()
 
   def toggleWithdrawProposal(self, value):
     """Toggles the the application state between withdraw and pending.