linux-kernel - [PATCH AUTOSEL 6.6 170/294] crypto: ahash

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Message-Id: <20250505225634.2688578-170-sashal@kernel.org>
Date: Mon,  5 May 2025 18:54:30 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
	Sasha Levin <sashal@...nel.org>,
	davem@...emloft.net,
	linux-crypto@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 170/294] crypto: ahash - Set default reqsize from ahash_alg

From: Herbert Xu <herbert@...dor.apana.org.au>

[ Upstream commit 9e01aaa1033d6e40f8d7cf4f20931a61ce9e3f04 ]

Add a reqsize field to struct ahash_alg and use it to set the
default reqsize so that algorithms with a static reqsize are
not forced to create an init_tfm function.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 crypto/ahash.c        | 4 ++++
 include/crypto/hash.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 709ef09407991..6168f3532f552 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -427,6 +427,7 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 	hash->setkey = ahash_nosetkey;
 
 	crypto_ahash_set_statesize(hash, alg->halg.statesize);
+	crypto_ahash_set_reqsize(hash, alg->reqsize);
 
 	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 		return crypto_init_shash_ops_async(tfm);
@@ -599,6 +600,9 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
 	if (alg->halg.statesize == 0)
 		return -EINVAL;
 
+	if (alg->reqsize && alg->reqsize < alg->halg.statesize)
+		return -EINVAL;
+
 	err = hash_prepare_alg(&alg->halg);
 	if (err)
 		return err;
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index f7c2a22cd776d..c0d472fdc82e6 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -153,6 +153,7 @@ struct ahash_request {
  *	      This is a counterpart to @init_tfm, used to remove
  *	      various changes set in @init_tfm.
  * @clone_tfm: Copy transform into new object, may allocate memory.
+ * @reqsize: Size of the request context.
  * @halg: see struct hash_alg_common
  */
 struct ahash_alg {
@@ -169,6 +170,8 @@ struct ahash_alg {
 	void (*exit_tfm)(struct crypto_ahash *tfm);
 	int (*clone_tfm)(struct crypto_ahash *dst, struct crypto_ahash *src);
 
+	unsigned int reqsize;
+
 	struct hash_alg_common halg;
 };
 
-- 
2.39.5