[PATCH 0/2] crypto: two minor fixes

[PATCH 0/2] crypto: two minor fixes

[Daniel P. Berrangé]

Daniel P. Berrangé (2):
  crypto: avoid leak of ctx when bad cipher mode is given
  crypto: use consistent error reporting pattern for unsupported cipher
    modes

 crypto/cipher-nettle.c.inc | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

-- 
2.45.1

[PATCH 1/2] crypto: avoid leak of ctx when bad cipher mode is given

[Daniel P. Berrangé]

This fixes Coverity CID-1546884

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 crypto/cipher-nettle.c.inc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/crypto/cipher-nettle.c.inc b/crypto/cipher-nettle.c.inc
index 42b39e18a2..766de036ba 100644
--- a/crypto/cipher-nettle.c.inc
+++ b/crypto/cipher-nettle.c.inc
@@ -734,16 +734,19 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
 #ifdef CONFIG_CRYPTO_SM4
     case QCRYPTO_CIPHER_ALG_SM4:
         {
-            QCryptoNettleSm4 *ctx = g_new0(QCryptoNettleSm4, 1);
+            QCryptoNettleSm4 *ctx;
+            const QCryptoCipherDriver *drv;
 
             switch (mode) {
             case QCRYPTO_CIPHER_MODE_ECB:
-                ctx->base.driver = &qcrypto_nettle_sm4_driver_ecb;
+                drv = &qcrypto_nettle_sm4_driver_ecb;
                 break;
             default:
                 goto bad_cipher_mode;
             }
 
+            ctx = g_new0(QCryptoNettleSm4, 1);
+            ctx->base.driver = drv;
             sm4_set_encrypt_key(&ctx->key[0], key);
             sm4_set_decrypt_key(&ctx->key[1], key);
 
-- 
2.45.1

Re: [PATCH 1/2] crypto: avoid leak of ctx when bad cipher mode is given

[Peter Maydell]

On Mon, 10 Jun 2024 at 10:42, Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> This fixes Coverity CID-1546884
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM

Re: [PATCH 1/2] crypto: avoid leak of ctx when bad cipher mode is given

[Philippe Mathieu-Daudé]

On 10/6/24 11:40, Daniel P. Berrangé wrote:
> This fixes Coverity CID-1546884
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>   crypto/cipher-nettle.c.inc | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Re: [PATCH 1/2] crypto: avoid leak of ctx when bad cipher mode is given

[Markus Armbruster]

Daniel P. Berrangé <berrange@redhat.com> writes:

> This fixes Coverity CID-1546884

We usually say

  Fixes: Coverity CID 1546884

> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

[PATCH 2/2] crypto: use consistent error reporting pattern for unsupported cipher modes

[Daniel P. Berrangé]

Not all paths in qcrypto_cipher_ctx_new() were correctly distinguishing
between valid user input for cipher mode (which should report a user
facing error), vs program logic errors (which should assert).

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 crypto/cipher-nettle.c.inc | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/crypto/cipher-nettle.c.inc b/crypto/cipher-nettle.c.inc
index 766de036ba..2654b439c1 100644
--- a/crypto/cipher-nettle.c.inc
+++ b/crypto/cipher-nettle.c.inc
@@ -525,8 +525,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
             case QCRYPTO_CIPHER_MODE_CTR:
                 drv = &qcrypto_nettle_des_driver_ctr;
                 break;
-            default:
+            case QCRYPTO_CIPHER_MODE_XTS:
                 goto bad_cipher_mode;
+            default:
+                g_assert_not_reached();
             }
 
             ctx = g_new0(QCryptoNettleDES, 1);
@@ -551,8 +553,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
             case QCRYPTO_CIPHER_MODE_CTR:
                 drv = &qcrypto_nettle_des3_driver_ctr;
                 break;
-            default:
+            case QCRYPTO_CIPHER_MODE_XTS:
                 goto bad_cipher_mode;
+            default:
+                g_assert_not_reached();
             }
 
             ctx = g_new0(QCryptoNettleDES3, 1);
@@ -663,8 +667,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
             case QCRYPTO_CIPHER_MODE_CTR:
                 drv = &qcrypto_nettle_cast128_driver_ctr;
                 break;
-            default:
+            case QCRYPTO_CIPHER_MODE_XTS:
                 goto bad_cipher_mode;
+            default:
+                g_assert_not_reached();
             }
 
             ctx = g_new0(QCryptoNettleCAST128, 1);
@@ -741,8 +747,12 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
             case QCRYPTO_CIPHER_MODE_ECB:
                 drv = &qcrypto_nettle_sm4_driver_ecb;
                 break;
-            default:
+            case QCRYPTO_CIPHER_MODE_CBC:
+            case QCRYPTO_CIPHER_MODE_CTR:
+            case QCRYPTO_CIPHER_MODE_XTS:
                 goto bad_cipher_mode;
+            default:
+                g_assert_not_reached();
             }
 
             ctx = g_new0(QCryptoNettleSm4, 1);
-- 
2.45.1