Prevention exception on IsValidSignatureBasedOnCurrentSafeboxState

src/core/UOpTransaction.pas

@@ -393,6 +393,7 @@ end;
 function TOpChangeAccountInfo.IsValidSignatureBasedOnCurrentSafeboxState(ASafeBoxTransaction: TPCSafeBoxTransaction): Boolean;
 var LAccount : TAccount;
 begin
+  if (FData.account_signer<0) or (FData.account_signer>=ASafeBoxTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
   LAccount := ASafeBoxTransaction.Account(FData.account_signer);
   Result := IsValidECDSASignature(LAccount.accountInfo.accountkey,FData.sign);
 end;
@@ -1133,6 +1134,7 @@ end;
 function TOpTransaction.IsValidSignatureBasedOnCurrentSafeboxState(ASafeBoxTransaction: TPCSafeBoxTransaction): Boolean;
 var LAccount : TAccount;
 begin
+  if (FData.sender<0) or (FData.sender>=ASafeBoxTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
   LAccount := ASafeBoxTransaction.Account(FData.sender);
   Result := IsValidECDSASignature(LAccount.accountInfo.accountkey,FData.sign);
 end;
@@ -1579,6 +1581,7 @@ end;
 function TOpChangeKey.IsValidSignatureBasedOnCurrentSafeboxState(ASafeBoxTransaction: TPCSafeBoxTransaction): Boolean;
 var LAccount : TAccount;
 begin
+  if (FData.account_signer<0) or (FData.account_signer>=ASafeBoxTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
   LAccount := ASafeBoxTransaction.Account(FData.account_signer);
   Result := IsValidECDSASignature(LAccount.accountInfo.accountkey,FData.sign);
 end;
@@ -2163,6 +2166,7 @@ end;
 function TOpListAccount.IsValidSignatureBasedOnCurrentSafeboxState(ASafeBoxTransaction: TPCSafeBoxTransaction): Boolean;
 var LAccount : TAccount;
 begin
+  if (FData.account_signer<0) or (FData.account_signer>=ASafeBoxTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
   LAccount := ASafeBoxTransaction.Account(FData.account_signer);
   Result := IsValidECDSASignature(LAccount.accountInfo.accountkey,FData.sign);
 end;
@@ -2574,6 +2578,7 @@ end;
 function TOpData.IsValidSignatureBasedOnCurrentSafeboxState(ASafeBoxTransaction: TPCSafeBoxTransaction): Boolean;
 var LAccount : TAccount;
 begin
+  if (FData.account_signer<0) or (FData.account_signer>=ASafeBoxTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
   LAccount := ASafeBoxTransaction.Account(FData.account_signer);
   Result := IsValidECDSASignature(LAccount.accountInfo.accountkey,FData.sign);
 end;

src/core/UTxMultiOperation.pas

@@ -504,6 +504,7 @@ begin
     ophtosign := GetDigestToSign;
     // Tx verification
     For i:=Low(FData.txSenders) to High(FData.txSenders) do begin
+      if (FData.txSenders[i].Account<0) or (FData.txSenders[i].Account>=AccountTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
       acc := AccountTransaction.Account(FData.txSenders[i].Account);
       If (length(FData.txSenders[i].Signature.r)>0) And
          (length(FData.txSenders[i].Signature.s)>0) then begin
@@ -523,6 +524,7 @@ begin
     end;
     // Change verification
     For i:=Low(FData.changesInfo) to High(FData.changesInfo) do begin
+      if (FData.changesInfo[i].Account<0) or (FData.changesInfo[i].Account>=AccountTransaction.FreezedSafeBox.AccountsCount) then Exit(False); // Preventing exception
       acc := AccountTransaction.Account(FData.changesInfo[i].Account);
       If (length(FData.changesInfo[i].Signature.r)>0) And
          (length(FData.changesInfo[i].Signature.s)>0) then begin