isl_qpolynomial_* constructors: check dim before accessing fields

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

diff --git a/isl_polynomial.c b/isl_polynomial.c
index 4ac53ab..d8beffc 100644 (file)
--- a/isl_polynomial.c
+++ b/isl_polynomial.c
@@ -1522,26 +1522,36 @@ error:
 
 __isl_give isl_qpolynomial *isl_qpolynomial_zero(__isl_take isl_dim *dim)
 {
+       if (!dim)
+               return NULL;
        return isl_qpolynomial_alloc(dim, 0, isl_upoly_zero(dim->ctx));
 }
 
 __isl_give isl_qpolynomial *isl_qpolynomial_one(__isl_take isl_dim *dim)
 {
+       if (!dim)
+               return NULL;
        return isl_qpolynomial_alloc(dim, 0, isl_upoly_one(dim->ctx));
 }
 
 __isl_give isl_qpolynomial *isl_qpolynomial_infty(__isl_take isl_dim *dim)
 {
+       if (!dim)
+               return NULL;
        return isl_qpolynomial_alloc(dim, 0, isl_upoly_infty(dim->ctx));
 }
 
 __isl_give isl_qpolynomial *isl_qpolynomial_neginfty(__isl_take isl_dim *dim)
 {
+       if (!dim)
+               return NULL;
        return isl_qpolynomial_alloc(dim, 0, isl_upoly_neginfty(dim->ctx));
 }
 
 __isl_give isl_qpolynomial *isl_qpolynomial_nan(__isl_take isl_dim *dim)
 {
+       if (!dim)
+               return NULL;
        return isl_qpolynomial_alloc(dim, 0, isl_upoly_nan(dim->ctx));
 }
 
@@ -1551,6 +1561,9 @@ __isl_give isl_qpolynomial *isl_qpolynomial_cst(__isl_take isl_dim *dim,
        struct isl_qpolynomial *qp;
        struct isl_upoly_cst *cst;
 
+       if (!dim)
+               return NULL;
+
        qp = isl_qpolynomial_alloc(dim, 0, isl_upoly_zero(dim->ctx));
        if (!qp)
                return NULL;