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From:   Giovanni Cabiddu <giovanni.cabiddu@intel.com>
To:     herbert@gondor.apana.org.au
Cc:     linux-crypto@vger.kernel.org, qat-linux@intel.com,
        vdronov@redhat.com, Giovanni Cabiddu <giovanni.cabiddu@intel.com>,
        stable@vger.kernel.org, Adam Guerin <adam.guerin@intel.com>,
        Wojciech Ziemba <wojciech.ziemba@intel.com>
Subject: [PATCH v2 04/11] crypto: qat - fix memory leak in RSA
Date:   Fri,  6 May 2022 15:38:56 +0100
Message-Id: <20220506143903.31776-5-giovanni.cabiddu@intel.com>
In-Reply-To: <20220506143903.31776-1-giovanni.cabiddu@intel.com>
References: <20220506143903.31776-1-giovanni.cabiddu@intel.com>
MIME-Version: 1.0
Organization: Intel Research and Development Ireland Ltd - Co. Reg. #308263 - Collinstown Industrial Park, Leixlip, County Kildare - Ireland
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When an RSA key represented in form 2 (as defined in PKCS #1 V2.1) is
used, some components of the private key persist even after the TFM is
released.
Replace the explicit calls to free the buffers in qat_rsa_exit_tfm()
with a call to qat_rsa_clear_ctx() which frees all buffers referenced in
the TFM context.

Cc: stable@vger.kernel.org
Fixes: 879f77e9071f ("crypto: qat - Add RSA CRT mode")
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Adam Guerin <adam.guerin@intel.com>
Reviewed-by: Wojciech Ziemba <wojciech.ziemba@intel.com>
---
 drivers/crypto/qat/qat_common/qat_asym_algs.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/crypto/qat/qat_common/qat_asym_algs.c b/drivers/crypto/qat/qat_common/qat_asym_algs.c
index 306219a4b00e..9be972430f11 100644
--- a/drivers/crypto/qat/qat_common/qat_asym_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_asym_algs.c
@@ -1254,18 +1254,8 @@ static void qat_rsa_exit_tfm(struct crypto_akcipher *tfm)
 	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 	struct device *dev = &GET_DEV(ctx->inst->accel_dev);
 
-	if (ctx->n)
-		dma_free_coherent(dev, ctx->key_sz, ctx->n, ctx->dma_n);
-	if (ctx->e)
-		dma_free_coherent(dev, ctx->key_sz, ctx->e, ctx->dma_e);
-	if (ctx->d) {
-		memset(ctx->d, '\0', ctx->key_sz);
-		dma_free_coherent(dev, ctx->key_sz, ctx->d, ctx->dma_d);
-	}
+	qat_rsa_clear_ctx(dev, ctx);
 	qat_crypto_put_instance(ctx->inst);
-	ctx->n = NULL;
-	ctx->e = NULL;
-	ctx->d = NULL;
 }
 
 static struct akcipher_alg rsa = {
-- 
2.35.1