From 8bb5561932bd337c65393d9abea1fb97be87a17b Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@univ-fcomte.fr>
Date: Sun, 20 Aug 2017 23:15:09 +0200
Subject: [PATCH 1/1] Ensure that low is valid before using it.

---
 src/smpi/internals/smpi_shared.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/smpi/internals/smpi_shared.cpp b/src/smpi/internals/smpi_shared.cpp
index 27bd066e70..0dec96a395 100644
--- a/src/smpi/internals/smpi_shared.cpp
+++ b/src/smpi/internals/smpi_shared.cpp
@@ -388,7 +388,7 @@ int smpi_is_shared(void* ptr, std::vector<std::pair<size_t, size_t>> &private_bl
     return 0;
   if ( smpi_cfg_shared_malloc == shmalloc_local || smpi_cfg_shared_malloc == shmalloc_global) {
     auto low = allocs_metadata.lower_bound(ptr);
-    if (low->first==ptr) {
+    if (low != allocs_metadata.end() && low->first == ptr) {
       private_blocks = low->second.private_blocks;
       *offset = 0;
       return 1;
-- 
2.20.1