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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Dominik Przychodni <dominik.przychodni@intel.com>,
        Giovanni Cabiddu <giovanni.cabiddu@intel.com>,
        Herbert Xu <herbert@gondor.apana.org.au>
Subject: [PATCH 5.9 15/15] crypto: qat - check cipher length for aead AES-CBC-HMAC-SHA
Date:   Fri, 16 Oct 2020 11:08:17 +0200
Message-Id: <20201016090437.920293529@linuxfoundation.org>
In-Reply-To: <20201016090437.170032996@linuxfoundation.org>
References: <20201016090437.170032996@linuxfoundation.org>
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From: Dominik Przychodni <dominik.przychodni@intel.com>

commit 45cb6653b0c355fc1445a8069ba78a4ce8720511 upstream.

Return -EINVAL for authenc(hmac(sha1),cbc(aes)),
authenc(hmac(sha256),cbc(aes)) and authenc(hmac(sha512),cbc(aes))
if the cipher length is not multiple of the AES block.
This is to prevent an undefined device behaviour.

Fixes: d370cec32194 ("crypto: qat - Intel(R) QAT crypto interface")
Cc: <stable@vger.kernel.org>
Signed-off-by: Dominik Przychodni <dominik.przychodni@intel.com>
[giovanni.cabiddu@intel.com: reworded commit message]
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/crypto/qat/qat_common/qat_algs.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/crypto/qat/qat_common/qat_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_algs.c
@@ -828,6 +828,11 @@ static int qat_alg_aead_dec(struct aead_
 	struct icp_qat_fw_la_bulk_req *msg;
 	int digst_size = crypto_aead_authsize(aead_tfm);
 	int ret, ctr = 0;
+	u32 cipher_len;
+
+	cipher_len = areq->cryptlen - digst_size;
+	if (cipher_len % AES_BLOCK_SIZE != 0)
+		return -EINVAL;
 
 	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->src, areq->dst, qat_req);
 	if (unlikely(ret))
@@ -842,7 +847,7 @@ static int qat_alg_aead_dec(struct aead_
 	qat_req->req.comn_mid.src_data_addr = qat_req->buf.blp;
 	qat_req->req.comn_mid.dest_data_addr = qat_req->buf.bloutp;
 	cipher_param = (void *)&qat_req->req.serv_specif_rqpars;
-	cipher_param->cipher_length = areq->cryptlen - digst_size;
+	cipher_param->cipher_length = cipher_len;
 	cipher_param->cipher_offset = areq->assoclen;
 	memcpy(cipher_param->u.cipher_IV_array, areq->iv, AES_BLOCK_SIZE);
 	auth_param = (void *)((u8 *)cipher_param + sizeof(*cipher_param));
@@ -871,6 +876,9 @@ static int qat_alg_aead_enc(struct aead_
 	u8 *iv = areq->iv;
 	int ret, ctr = 0;
 
+	if (areq->cryptlen % AES_BLOCK_SIZE != 0)
+		return -EINVAL;
+
 	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->src, areq->dst, qat_req);
 	if (unlikely(ret))
 		return ret;