From 63ee0954b7a14cb34aadc96e8ef51284964089a6 Mon Sep 17 00:00:00 2001
From: Boyu Yang <yangby@cryptape.com>
Date: Sun, 8 Nov 2020 20:30:29 +0800
Subject: [PATCH] fix: attempt to subtract with overflow

---
 src/subcommands/wallet/mod.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/subcommands/wallet/mod.rs b/src/subcommands/wallet/mod.rs
index 381f166e..d3b68252 100644
--- a/src/subcommands/wallet/mod.rs
+++ b/src/subcommands/wallet/mod.rs
@@ -364,9 +364,12 @@ impl<'a> WalletSubCommand<'a> {
         let mut infos: Vec<LiveCellInfo> = Default::default();
 
         fn enough_capacity(from_capacity: u64, to_capacity: u64, tx_fee: u64) -> bool {
-            let rest_capacity = from_capacity - to_capacity - tx_fee;
-            from_capacity >= to_capacity + tx_fee
-                && (rest_capacity >= MIN_SECP_CELL_CAPACITY || tx_fee + rest_capacity < ONE_CKB)
+            if from_capacity < to_capacity + tx_fee {
+                false
+            } else {
+                let rest_capacity = from_capacity - to_capacity - tx_fee;
+                rest_capacity >= MIN_SECP_CELL_CAPACITY || tx_fee + rest_capacity < ONE_CKB
+            }
         }
         let mut terminator = |_, info: &LiveCellInfo| {
             if enough_capacity(from_capacity, to_capacity, tx_fee) {