From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 2 Oct 2025 09:45:39 +0000 (+0800)
Subject: crypto: rng - Ensure set_ent is always present
X-Git-Tag: v6.1.156~150
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17acbcd44fe8dc17dc1072375e76df2d52da6ac8;p=thirdparty%2Fkernel%2Fstable.git

crypto: rng - Ensure set_ent is always present

commit c0d36727bf39bb16ef0a67ed608e279535ebf0da upstream.

Ensure that set_ent is always set since only drbg provides it.

Fixes: 77ebdabe8de7 ("crypto: af_alg - add extra parameters for DRBG interface")
Reported-by: Yiqi Sun <sunyiqixm@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/crypto/rng.c b/crypto/rng.c
index fea082b25fe4b..a2bf2efb7937f 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -174,6 +174,11 @@ out:
 EXPORT_SYMBOL_GPL(crypto_del_default_rng);
 #endif
 
+static void rng_default_set_ent(struct crypto_rng *tfm, const u8 *data,
+				unsigned int len)
+{
+}
+
 int crypto_register_rng(struct rng_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;
@@ -185,6 +190,9 @@ int crypto_register_rng(struct rng_alg *alg)
 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 	base->cra_flags |= CRYPTO_ALG_TYPE_RNG;
 
+	if (!alg->set_ent)
+		alg->set_ent = rng_default_set_ent;
+
 	return crypto_register_alg(base);
 }
 EXPORT_SYMBOL_GPL(crypto_register_rng);