isl_dim_tuple_match: handle NULL input

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

diff --git a/isl_dim.c b/isl_dim.c
index 771a71d..9f9e55c 100644 (file)
--- a/isl_dim.c
+++ b/isl_dim.c
@@ -394,6 +394,9 @@ int isl_dim_tuple_match(__isl_keep isl_dim *dim1, enum isl_dim_type dim1_type,
        struct isl_name *name1, *name2;
        isl_dim *nested1, *nested2;
 
+       if (!dim1 || !dim2)
+               return -1;
+
        if (n(dim1, dim1_type) != n(dim2, dim2_type))
                return 0;
        name1 = tuple_name(dim1, dim1_type);