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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/net/ipv4/tcp_fastopen.c
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@@ -312,6 +312,7 @@
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 static bool tcp_fastopen_queue_check(struct sock *sk)
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 {
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 	struct fastopen_queue *fastopenq;
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+	int max_qlen;
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 	/* Make sure the listener has enabled fastopen, and we don't
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 	 * exceed the max # of pending TFO requests allowed before trying
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@@ -324,10 +325,11 @@
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 	 * temporarily vs a server not supporting Fast Open at all.
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 	 */
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 	fastopenq = &inet_csk(sk)->icsk_accept_queue.fastopenq;
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-	if (fastopenq->max_qlen == 0)
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+	max_qlen = READ_ONCE(fastopenq->max_qlen);
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+	if (max_qlen == 0)
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 		return false;
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-	if (fastopenq->qlen >= fastopenq->max_qlen) {
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+	if (fastopenq->qlen >= max_qlen) {
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 		struct request_sock *req1;
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 		spin_lock(&fastopenq->lock);
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 		req1 = fastopenq->rskq_rst_head;