fix: vulnerability causing division by zero with price rate calculation

src/action/execute/create_margin_order.rs

@@ -127,6 +127,12 @@ fn create_margin_open_order(
         return Err(StdError::generic_err("not valid collateral").into());
     }
 
+    if let Some(price) = &trigger_price {
+        if price.rate.is_zero() {
+            return Err(StdError::generic_err("trigger_price: The rate cannot be zero").into());
+        }
+    }
+
     let order = MarginOrder::new_open(
         &info.sender,
         &position,
@@ -222,6 +228,12 @@ fn create_margin_close_order(
         return Err(StdError::generic_err("this position had an order already assigned").into());
     };
 
+    if let Some(price) = &trigger_price {
+        if price.rate.is_zero() {
+            return Err(StdError::generic_err("trigger_price: The rate cannot be zero").into());
+        }
+    }
+
     let order = MarginOrder::new_close(
         &info.sender,
         mtp.position,

src/action/execute/create_spot_order.rs

@@ -24,6 +24,12 @@ pub fn create_spot_order(
         return Err(StdError::not_found("order price").into());
     }
 
+    if let Some(price) = &order_price {
+        if price.rate.is_zero() {
+            return Err(StdError::generic_err("order_price: The rate cannot be zero").into());
+        }
+    }
+
     check_denom_error(
         &order_source_denom,
         &order_target_denom,