diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index f0ee6b92132a..4e8b15c50481 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2593,6 +2593,9 @@ out_put:
 static int kern_spec_to_ib_spec(struct ib_uverbs_flow_spec *kern_spec,
 				union ib_flow_spec *ib_spec)
 {
+	if (kern_spec->reserved)
+		return -EINVAL;
+
 	ib_spec->type = kern_spec->type;
 
 	switch (ib_spec->type) {
@@ -2671,6 +2674,10 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 	    (cmd.flow_attr.num_of_specs * sizeof(struct ib_uverbs_flow_spec)))
 		return -EINVAL;
 
+	if (cmd.flow_attr.reserved[0] ||
+	    cmd.flow_attr.reserved[1])
+		return -EINVAL;
+
 	if (cmd.flow_attr.num_of_specs) {
 		kern_flow_attr = kmalloc(sizeof(*kern_flow_attr) + cmd.flow_attr.size,
 					 GFP_KERNEL);