1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0ac2bf4f8759..70f6cbd4ef73 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2011,6 +2011,14 @@ try_again:
 	}
 
 	WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk));
+
+	/*
+	 * skb->dev still aliases the UDP rx dev_scratch (its charge was freed
+	 * on dequeue above); a sockmap verdict program may deref it via
+	 * bpf_sk_lookup_*(), so clear it -> bpf_skc_lookup() uses skb->sk
+	 */
+	skb->dev = NULL;
+
 	return recv_actor(sk, skb);
 }