linux-kernel - [PATCH 17/22] crypto: chelsio - add check for xts input length equal to zero

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Date:   Fri,  7 Aug 2020 19:20:05 +0300
From:   Andrei Botila <andrei.botila@....nxp.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, x86@...nel.org,
        linux-arm-kernel@...s.com, Andrei Botila <andrei.botila@....com>,
        Ayush Sawal <ayush.sawal@...lsio.com>,
        Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
        Rohit Maheshwari <rohitm@...lsio.com>
Subject: [PATCH 17/22] crypto: chelsio - add check for xts input length equal to zero

From: Andrei Botila <andrei.botila@....com>

Standardize the way input lengths equal to 0 are handled in all skcipher
algorithms. All the algorithms return 0 for input lengths equal to zero.

Cc: Ayush Sawal <ayush.sawal@...lsio.com>
Cc: Vinay Kumar Yadav <vinay.yadav@...lsio.com>
Cc: Rohit Maheshwari <rohitm@...lsio.com>
Signed-off-by: Andrei Botila <andrei.botila@....com>
---
 drivers/crypto/chelsio/chcr_algo.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index 13b908ea4873..e9746580870a 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -1372,8 +1372,12 @@ static int chcr_aes_encrypt(struct skcipher_request *req)
 	int err;
 	struct uld_ctx *u_ctx = ULD_CTX(c_ctx(tfm));
 	struct chcr_context *ctx = c_ctx(tfm);
+	int subtype = get_cryptoalg_subtype(tfm);
 	unsigned int cpu;
 
+	if (!req->cryptlen && subtype == CRYPTO_ALG_SUB_TYPE_XTS)
+		return 0;
+
 	cpu = get_cpu();
 	reqctx->txqidx = cpu % ctx->ntxq;
 	reqctx->rxqidx = cpu % ctx->nrxq;
-- 
2.17.1