From d4fdc2dfaa755e0bf22de6a2774cac2e5ae45cf4 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 2 Jan 2020 20:04:40 -0800 Subject: [PATCH] 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 Signed-off-by: Herbert Xu --- crypto/aead.c | 3 +++ crypto/ahash.c | 3 +++ crypto/akcipher.c | 2 ++ crypto/shash.c | 3 +++ crypto/skcipher.c | 3 +++ 5 files changed, 14 insertions(+) diff --git a/crypto/aead.c b/crypto/aead.c index 7707d3223101..16991095270d 100644 --- 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 index cd5d9847d513..68a0f0cb75c4 100644 --- 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 index eeed6c151d2f..f866085c8a4a 100644 --- 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 index 70faf28b2d14..c075b26c2a1d 100644 --- 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 index 42add1e0814f..7221def7b9a7 100644 --- 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;