Check block number first before checking signer

omgnetwork · Sep 2, 2018 · e1006b5 · e1006b5
1 parent 9578790
commit e1006b5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/plasma_cash/root_chain/contracts/RootChain/RootChain.sol b/plasma_cash/root_chain/contracts/RootChain/RootChain.sol
@@ -149,7 +149,7 @@ contract RootChain {
         bytes32 root = childChain[blkNum];
         require(merkleHash.checkMembership(uid, root, proof));
 
-        if (exitTxObj.newOwner == challengeTxObj.signer) {
+        if (blkNum > exits[uid].exitTxBlkNum && exitTxObj.newOwner == challengeTxObj.signer) {
             // Challenge tx spent the exit tx. Cancel it.
             delete exits[uid].hasValue;
         } else if (blkNum < exits[uid].exitTxBlkNum