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-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c0d36727bf39bb16ef0a67ed608e279535ebf0da;p=users%2Fjedix%2Flinux-maple.git

crypto: rng - Ensure set_ent is always present

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>
---

diff --git a/crypto/rng.c b/crypto/rng.c
index b8ae6ebc091d..ee1768c5a400 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -168,6 +168,11 @@ 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;
@@ -179,6 +184,9 @@ 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);