From c2ed8618e489ee79ff9073e601f44c71d0ad987e Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Sun, 10 Dec 2017 15:32:42 +0000
Subject: [PATCH] easylogging++: avoid buffer underflow

---
 external/easylogging++/easylogging++.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/external/easylogging++/easylogging++.cc b/external/easylogging++/easylogging++.cc
index 31b201897..57742b2e5 100644
--- a/external/easylogging++/easylogging++.cc
+++ b/external/easylogging++/easylogging++.cc
@@ -1016,8 +1016,9 @@ const std::string OS::getBashOutput(const char* command) {
   char hBuff[4096];
   if (fgets(hBuff, sizeof(hBuff), proc) != nullptr) {
     pclose(proc);
-    if (hBuff[strlen(hBuff) - 1] == '\n') {
-      hBuff[strlen(hBuff) - 1] = '\0';
+    const size_t len = strlen(hBuff);
+    if (len > 0 && hBuff[len - 1] == '\n') {
+      hBuff[len- 1] = '\0';
     }
     return std::string(hBuff);
   }