isl_space_extend: avoid invalid access on error

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

diff --git a/isl_space.c b/isl_space.c
index bd7d15c..b0aca35 100644 (file)
--- a/isl_space.c
+++ b/isl_space.c
@@ -783,6 +783,8 @@ __isl_give isl_space *isl_space_extend(__isl_take isl_space *dim,
        isl_assert(dim->ctx, dim->n_out <= n_out, goto error);
 
        dim = isl_space_cow(dim);
+       if (!dim)
+               goto error;
 
        if (dim->ids) {
                ids = isl_calloc_array(dim->ctx, isl_id *,