From 63f86be18d5e3fe45b1d991681cd638cd4ff2565 Mon Sep 17 00:00:00 2001
From: Jack May <jack@solana.com>
Date: Mon, 16 Nov 2020 17:18:50 -0800
Subject: [PATCH] Fix negate with overflow (#117)

---
 src/vm.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vm.rs b/src/vm.rs
index ca52593a..66b2a1c2 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -618,7 +618,7 @@ impl<'a, E: UserDefinedError> EbpfVm<'a, E> {
                     }
                                     reg[dst] >>= reg[src]
                 },
-                ebpf::NEG64      => reg[dst] = -(reg[dst] as i64) as u64,
+                ebpf::NEG64      => reg[dst] = (reg[dst] as i64).wrapping_neg() as u64,
                 ebpf::MOD64_IMM  => reg[dst] %= insn.imm  as u64,
                 ebpf::MOD64_REG  => {
                     if reg[src] == 0 {