Reject dust amounts during validation

Replaces the validation check for "amount == 0" with an isDust check,
so very small output amounts are caught before the wallet
is unlocked, a transaction is created, etc.

1 files changed, 9 insertions, 12 deletions

diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index 876b7f808b..1c54850a03 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -101,24 +101,21 @@ bool SendCoinsEntry::validate()
     // Check input validity
     bool retval = true;
 
-    if(!ui->payAmount->validate())
+    if(!ui->payTo->hasAcceptableInput() ||
+       (model && !model->validateAddress(ui->payTo->text())))
     {
+        ui->payTo->setValid(false);
         retval = false;
     }
-    else
+
+    if(!ui->payAmount->validate())
     {
-        if(ui->payAmount->value() <= 0)
-        {
-            // Cannot send 0 coins or less
-            ui->payAmount->setValid(false);
-            retval = false;
-        }
+        retval = false;
     }
 
-    if(!ui->payTo->hasAcceptableInput() ||
-       (model && !model->validateAddress(ui->payTo->text())))
-    {
-        ui->payTo->setValid(false);
+    // Reject dust outputs:
+    if (retval && GUIUtil::isDust(ui->payTo->text(), ui->payAmount->value())) {
+        ui->payAmount->setValid(false);
         retval = false;
     }