diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 06bfe61d3cd3..c4eb06d37ae9 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2959,6 +2959,10 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func)
 	/* Misaligned rcu_head! */
 	WARN_ON_ONCE((unsigned long)head & (sizeof(void *) - 1));
 
+	/* Avoid NULL dereference if callback is NULL. */
+	if (WARN_ON_ONCE(!func))
+		return;
+
 	if (debug_rcu_head_queue(head)) {
 		/*
 		 * Probable double call_rcu(), so leak the callback.