Add test with transaction with no signatures

Add checks for no signature

runtime/src/bank.rs

@@ -312,13 +312,19 @@ impl Bank {
         let mut status_cache = self.status_cache.write().unwrap();
         for (i, tx) in txs.iter().enumerate() {
             match &res[i] {
-                Ok(_) => status_cache.add(&tx.signatures[0]),
+                Ok(_) => {
+                    if !tx.signatures.is_empty() {
+                        status_cache.add(&tx.signatures[0]);
+                    }
+                }
                 Err(BankError::BlockhashNotFound) => (),
                 Err(BankError::DuplicateSignature) => (),
                 Err(BankError::AccountNotFound) => (),
                 Err(e) => {
-                    status_cache.add(&tx.signatures[0]);
-                    status_cache.save_failure_status(&tx.signatures[0], e.clone());
+                    if !tx.signatures.is_empty() {
+                        status_cache.add(&tx.signatures[0]);
+                        status_cache.save_failure_status(&tx.signatures[0], e.clone());
+                    }
                 }
             }
         }
@@ -447,6 +453,9 @@ impl Bank {
         txs.iter()
             .zip(lock_results.into_iter())
             .map(|(tx, lock_res)| {
+                if tx.signatures.is_empty() {
+                    return lock_res;
+                }
                 if lock_res.is_ok() && StatusCache::has_signature_all(&caches, &tx.signatures[0]) {
                     error_counters.duplicate_signature += 1;
                     Err(BankError::DuplicateSignature)
@@ -1517,4 +1526,35 @@ mod tests {
         assert!(child.epoch_vote_accounts(i).is_some());
     }
 
+    #[test]
+    fn test_zero_signatures() {
+        solana_logger::setup();
+        let (genesis_block, mint_keypair) = GenesisBlock::new(500);
+        let bank = Arc::new(Bank::new(&genesis_block));
+        let key = Keypair::new();
+
+        let move_tokens = SystemInstruction::Move { tokens: 1 };
+
+        let mut tx = Transaction::new_unsigned(
+            &mint_keypair.pubkey(),
+            &[key.pubkey()],
+            system_program::id(),
+            &move_tokens,
+            bank.last_blockhash(),
+            2,
+        );
+
+        assert_eq!(
+            bank.process_transaction(&tx),
+            Err(BankError::MissingSignatureForFee)
+        );
+
+        // Set the fee to 0, this should give a ProgramError
+        // but since no signature we cannot look up the error.
+        tx.fee = 0;
+
+        assert_eq!(bank.process_transaction(&tx), Ok(()));
+        assert_eq!(bank.get_balance(&key.pubkey()), 0);
+    }
+
 }

sdk/src/transaction.rs

@@ -256,9 +256,11 @@ impl Transaction {
     // a hash of a slice of transactions only needs to hash the signatures
     pub fn hash(transactions: &[Transaction]) -> Hash {
         let mut hasher = Hasher::default();
-        transactions
-            .iter()
-            .for_each(|tx| hasher.hash(&tx.signatures[0].as_ref()));
+        transactions.iter().for_each(|tx| {
+            if !tx.signatures.is_empty() {
+                hasher.hash(&tx.signatures[0].as_ref());
+            }
+        });
         hasher.result()
     }