From d5d0d2bd778e2e330d156fc97a4ed6d45fe14991 Mon Sep 17 00:00:00 2001
From: Dev Ojha <ValarDragon@users.noreply.github.com>
Date: Mon, 10 Dec 2018 09:56:49 -0800
Subject: [PATCH] Make mempool fail txs with negative gas wanted (#2994)

This is only one part of #2989. We also need to fix the application,
and add rules to consensus to ensure this.
---
 mempool/mempool.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mempool/mempool.go b/mempool/mempool.go
index 8f70ec6c8..a64ce9188 100644
--- a/mempool/mempool.go
+++ b/mempool/mempool.go
@@ -108,6 +108,10 @@ func PostCheckMaxGas(maxGas int64) PostCheckFunc {
 		if maxGas == -1 {
 			return nil
 		}
+		if res.GasWanted < 0 {
+			return fmt.Errorf("gas wanted %d is negative",
+				res.GasWanted)
+		}
 		if res.GasWanted > maxGas {
 			return fmt.Errorf("gas wanted %d is greater than max gas %d",
 				res.GasWanted, maxGas)