diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 62a462413081..a5a1a1650668 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -4,6 +4,7 @@
 #include <linux/types.h>
 #include <linux/in6.h>
 #include <linux/siphash.h>
+#include <linux/string.h>
 #include <uapi/linux/if_ether.h>
 
 /**
@@ -185,4 +186,12 @@ static inline bool flow_keys_have_l4(struct flow_keys *keys)
 
 u32 flow_hash_from_keys(struct flow_keys *keys);
 
+static inline void
+flow_dissector_init_keys(struct flow_dissector_key_control *key_control,
+			 struct flow_dissector_key_basic *key_basic)
+{
+	memset(key_control, 0, sizeof(*key_control));
+	memset(key_basic, 0, sizeof(*key_basic));
+}
+
 #endif
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index e5a58c82728a..5ab8205f988b 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -127,6 +127,7 @@ static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 	struct fl_flow_key skb_key;
 	struct fl_flow_key skb_mkey;
 
+	flow_dissector_init_keys(&skb_key.control, &skb_key.basic);
 	fl_clear_masked_range(&skb_key, &head->mask);
 	skb_key.indev_ifindex = skb->skb_iif;
 	/* skb_flow_dissect() does not set n_proto in case an unknown protocol,