isl_dim_equal: handle NULL input

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

diff --git a/isl_dim.c b/isl_dim.c
index 9f9e55c..b850384 100644 (file)
--- a/isl_dim.c
+++ b/isl_dim.c
@@ -1037,6 +1037,8 @@ unsigned isl_dim_total(struct isl_dim *dim)
 
 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
 {
+       if (!dim1 || !dim2)
+               return -1;
        return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
               isl_dim_tuple_match(dim1, isl_dim_in, dim2, isl_dim_in) &&
               isl_dim_tuple_match(dim1, isl_dim_out, dim2, isl_dim_out);