From c9798ba2e9170afeb6781de487a8779235cef82d Mon Sep 17 00:00:00 2001
From: SChernykh <sergey.v.chernykh@gmail.com>
Date: Sun, 13 Oct 2019 22:13:29 +0200
Subject: [PATCH] Sync with latest RandomX code

Fix a possible out-of-bounds access in superscalar generator
---
 src/crypto/randomx/superscalar.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/crypto/randomx/superscalar.cpp b/src/crypto/randomx/superscalar.cpp
index aaa91f620..7586c0282 100644
--- a/src/crypto/randomx/superscalar.cpp
+++ b/src/crypto/randomx/superscalar.cpp
@@ -631,7 +631,7 @@ namespace randomx {
 				int cycle1 = scheduleUop<false>(mop.getUop1(), portBusy, cycle);
 				int cycle2 = scheduleUop<false>(mop.getUop2(), portBusy, cycle);
 
-				if (cycle1 == cycle2) {
+				if (cycle1 >= 0 && cycle1 == cycle2) {
 					if (commit) {
 						scheduleUop<true>(mop.getUop1(), portBusy, cycle1);
 						scheduleUop<true>(mop.getUop2(), portBusy, cycle2);
@@ -755,6 +755,12 @@ namespace randomx {
 				//recalculate when the instruction can be scheduled for execution based on operand availability
 				scheduleCycle = scheduleMop<true>(mop, portBusy, scheduleCycle, scheduleCycle);
 
+				if (scheduleCycle < 0) {
+					if (trace) std::cout << "Unable to map operation '" << mop.getName() << "' to execution port (cycle " << scheduleCycle << ")" << std::endl;
+					portsSaturated = true;
+					break;
+				}
+
 				//calculate when the result will be ready
 				depCycle = scheduleCycle + mop.getLatency();