diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index e893c0f6c879..fef69d2a6b18 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -1045,9 +1045,13 @@ EXPORT_SYMBOL_GPL(af_alg_sendpage);
 void af_alg_free_resources(struct af_alg_async_req *areq)
 {
 	struct sock *sk = areq->sk;
+	struct af_alg_ctx *ctx;
 
 	af_alg_free_areq_sgls(areq);
 	sock_kfree_s(sk, areq, areq->areqlen);
+
+	ctx = alg_sk(sk)->private;
+	ctx->inflight = false;
 }
 EXPORT_SYMBOL_GPL(af_alg_free_resources);
 
@@ -1117,11 +1121,19 @@ EXPORT_SYMBOL_GPL(af_alg_poll);
 struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk,
 					   unsigned int areqlen)
 {
-	struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
+	struct af_alg_ctx *ctx = alg_sk(sk)->private;
+	struct af_alg_async_req *areq;
 
+	/* Only one AIO request can be in flight. */
+	if (ctx->inflight)
+		return ERR_PTR(-EBUSY);
+
+	areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
 	if (unlikely(!areq))
 		return ERR_PTR(-ENOMEM);
 
+	ctx->inflight = true;
+
 	areq->areqlen = areqlen;
 	areq->sk = sk;
 	areq->last_rsgl = NULL;
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index a5db86670bdf..a406e281ae57 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -138,6 +138,7 @@ struct af_alg_async_req {
  *			recvmsg is invoked.
  * @init:		True if metadata has been sent.
  * @len:		Length of memory allocated for this data structure.
+ * @inflight:		Non-zero when AIO requests are in flight.
  */
 struct af_alg_ctx {
 	struct list_head tsgl_list;
@@ -156,6 +157,8 @@ struct af_alg_ctx {
 	bool init;
 
 	unsigned int len;
+
+	unsigned int inflight;
 };
 
 int af_alg_register_type(const struct af_alg_type *type);