isl_affine_hull.c: affine_hull: fix erro handling

diff --git a/isl_affine_hull.c b/isl_affine_hull.c
index df26cf9..8356446 100644 (file)
--- a/isl_affine_hull.c
+++ b/isl_affine_hull.c
@@ -206,6 +206,9 @@ static struct isl_basic_set *affine_hull(
        int col;
        int row;
 
+       if (!bset1 || !bset2)
+               goto error;
+
        total = 1 + isl_basic_set_n_dim(bset1);
 
        row = 0;
@@ -226,12 +229,13 @@ static struct isl_basic_set *affine_hull(
                                --row;
                }
        }
-       isl_basic_set_free(bset2);
        isl_assert(bset1->ctx, row == bset1->n_eq, goto error);
+       isl_basic_set_free(bset2);
        bset1 = isl_basic_set_normalize_constraints(bset1);
        return bset1;
 error:
        isl_basic_set_free(bset1);
+       isl_basic_set_free(bset2);
        return NULL;
 }