From c94e821e152ba209559e8b646a70c4a77849f13e Mon Sep 17 00:00:00 2001
From: Augustin Degomme <degomme@idpann.imag.fr>
Date: Tue, 9 Apr 2013 11:23:28 +0200
Subject: [PATCH 1/1] do not allocate 0 sized buffers which won't be
 copied/freed after

---
 src/smpi/smpi_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/smpi/smpi_base.c b/src/smpi/smpi_base.c
index 6ffe7f6484..f5a219247d 100644
--- a/src/smpi/smpi_base.c
+++ b/src/smpi/smpi_base.c
@@ -197,7 +197,7 @@ static MPI_Request build_request(void *buf, int count,
   if(datatype->has_subtype == 1){
     // This part handles the problem of non-contiguous memory
     old_buf = buf;
-    buf = xbt_malloc(count*smpi_datatype_size(datatype));
+    buf = count==0 ? NULL : xbt_malloc(count*smpi_datatype_size(datatype));
     if (flags & SEND) {
       subtype->serialize(old_buf, buf, count, datatype->substruct);
     }
-- 
2.20.1