From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Wed, 6 Feb 2013 21:40:14 +0000 (+0100)
Subject: Return MPI_UNDEFINED for negative values too.
X-Git-Tag: v3_9_90~510^2~15
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/bee82a5da884fdedb7ee1d9198ceac7d529af7f5?ds=sidebyside

Return MPI_UNDEFINED for negative values too.
---

diff --git a/src/smpi/smpi_group.c b/src/smpi/smpi_group.c
index e84ed8e2dc..0222b881c3 100644
--- a/src/smpi/smpi_group.c
+++ b/src/smpi/smpi_group.c
@@ -66,7 +66,7 @@ int smpi_group_index(MPI_Group group, int rank)
 {
   int index = MPI_UNDEFINED;
 
-  if (rank < group->size) {
+  if (0 <= rank && rank < group->size) {
     index = group->rank_to_index_map[rank];
   }
   return index;