isl_vertices.c: compute_chambers: avoid invalid access on error path

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_vertices.c b/isl_vertices.c
index efd534b..cd8f463 100644 (file)
--- a/isl_vertices.c
+++ b/isl_vertices.c
@@ -879,6 +879,8 @@ static __isl_give isl_vertices *compute_chambers(__isl_take isl_basic_set *bset,
        bset = isl_basic_set_params(bset);
 
        tab = isl_tab_from_basic_set(bset, 1);
+       if (!tab)
+               goto error;
        for (i = 0; i < bset->n_ineq; ++i)
                if (isl_tab_freeze_constraint(tab, i) < 0)
                        goto error;