crypto: algapi - enforce that all instances have a ->free() method

All instances need to have a ->free() method, but people could forget to set it and then not notice if the instance is never unregistered. To help detect this bug earlier, don't allow an instance without a ->free() method to be registered, and complain loudly if someone tries to do it. Signed-off-by: Eric Biggers <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
ambv · Jan 9, 2020 · d4fdc2d · d4fdc2d
1 parent a24a1fd
commit d4fdc2d
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Showing 5 changed files with 14 additions and 0 deletions.
diff --git a/crypto/aead.c b/crypto/aead.c
@@ -288,6 +288,9 @@ int aead_register_instance(struct crypto_template *tmpl,
 {
 	int err;
 
+	if (WARN_ON(!inst->free))
+		return -EINVAL;
+
 	err = aead_prepare_alg(&inst->alg);
 	if (err)
 		return err;

diff --git a/crypto/ahash.c b/crypto/ahash.c
@@ -656,6 +656,9 @@ int ahash_register_instance(struct crypto_template *tmpl,
 {
 	int err;
 
+	if (WARN_ON(!inst->free))
+		return -EINVAL;
+
 	err = ahash_prepare_alg(&inst->alg);
 	if (err)
 		return err;

diff --git a/crypto/akcipher.c b/crypto/akcipher.c
@@ -147,6 +147,8 @@ EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
 int akcipher_register_instance(struct crypto_template *tmpl,
 			       struct akcipher_instance *inst)
 {
+	if (WARN_ON(!inst->free))
+		return -EINVAL;
 	akcipher_prepare_alg(&inst->alg);
 	return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
 }

diff --git a/crypto/shash.c b/crypto/shash.c
@@ -577,6 +577,9 @@ int shash_register_instance(struct crypto_template *tmpl,
 {
 	int err;
 
+	if (WARN_ON(!inst->free))
+		return -EINVAL;
+
 	err = shash_prepare_alg(&inst->alg);
 	if (err)
 		return err;

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
@@ -865,6 +865,9 @@ int skcipher_register_instance(struct crypto_template *tmpl,
 {
 	int err;
 
+	if (WARN_ON(!inst->free))
+		return -EINVAL;
+
 	err = skcipher_prepare_alg(&inst->alg);
 	if (err)
 		return err;