IB/uverbs: Fix validating mandatory attributes

Previously, if a method contained mandatory attributes in a namespace
that wasn't given by the user, these attributes weren't validated.
Fixing this by iterating over all specification namespaces.

Fixes: fac9658cabb9 ("IB/core: Add new ioctl interface")
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/uverbs_ioctl.c

@@ -234,6 +234,15 @@ static int uverbs_validate_kernel_mandatory(const struct uverbs_method_spec *met
 			return -EINVAL;
 	}
 
+	for (; i < method_spec->num_buckets; i++) {
+		struct uverbs_attr_spec_hash *attr_spec_bucket =
+			method_spec->attr_buckets[i];
+
+		if (!bitmap_empty(attr_spec_bucket->mandatory_attrs_bitmask,
+				  attr_spec_bucket->num_attrs))
+			return -EINVAL;
+	}
+
 	return 0;
 }