FAILED: patch "[PATCH] crypto: rsa-pkcs1pad - only allow with rsa" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9b30430ea356f237945e52f8a3a42158877bd5a9 Mon Sep 17 00:00:00 2001
From: Eric Biggers <[email protected]>
Date: Tue, 18 Jan 2022 16:13:02 -0800
Subject: [PATCH] crypto: rsa-pkcs1pad - only allow with rsa

The pkcs1pad template can be instantiated with an arbitrary akcipher algorithm, which doesn't make sense; it is specifically an RSA padding scheme. Make it check that the underlying algorithm really is RSA.

index 8ac3e73e8ea6..1b3545781425 100644
@@ -621,6 +621,11 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
 
 	rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
 
+	if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) {
+		err = -EINVAL;
+		goto err_free_inst;
+	}
+
 	err = -ENAMETOOLONG;
 	hash_name = crypto_attr_alg_name(tb[2]);
 	if (IS_ERR(hash_name)) {