From e5e70d94a1f6b3acd9953b35ac389a0f535d7717 Mon Sep 17 00:00:00 2001
From: Sven Verdoolaege <skimo@kotnet.org>
Date: Fri, 5 Jul 2013 19:23:42 +0200
Subject: [PATCH] isl_tab_pip.c: tab_for_lexmin: accept NULL pointer on
 zero-size allocation

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
---
 isl_tab_pip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/isl_tab_pip.c b/isl_tab_pip.c
index 6e575c1c..9173fd33 100644
--- a/isl_tab_pip.c
+++ b/isl_tab_pip.c
@@ -2087,7 +2087,7 @@ static struct isl_tab *tab_for_lexmin(struct isl_basic_map *bmap,
 		tab->n_div = dom->n_div;
 		tab->row_sign = isl_calloc_array(bmap->ctx,
 					enum isl_tab_row_sign, tab->mat->n_row);
-		if (!tab->row_sign)
+		if (tab->mat->n_row && !tab->row_sign)
 			goto error;
 	}
 	if (ISL_F_ISSET(bmap, ISL_BASIC_MAP_EMPTY)) {
-- 
2.11.4.GIT