linux-kernel - [PATCH v2 07/12] crypto: caam/jr - add xts check for block length equal to zero

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Date:   Mon, 21 Sep 2020 10:32:00 +0300
From:   Andrei Botila <andrei.botila@....nxp.com>
To:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 07/12] crypto: caam/jr - add xts check for block length equal to zero

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

XTS should not return succes when dealing with block length equal to zero.
This is different than the rest of the skcipher algorithms.

Fixes: 31bb2f0da1b50 ("crypto: caam - check zero-length input")
Cc: <stable@...r.kernel.org> # v5.4+
Signed-off-by: Andrei Botila <andrei.botila@....com>
---
 drivers/crypto/caam/caamalg.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index ba70db61a76d..b5f8823e4300 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -1790,7 +1790,12 @@ static inline int skcipher_crypt(struct skcipher_request *req, bool encrypt)
 	u32 *desc;
 	int ret = 0;
 
-	if (!req->cryptlen)
+	/*
+	 * XTS is expected to return an error even for input length = 0
+	 * Note that the case input length < block size will be caught during
+	 * HW offloading and return an error.
+	 */
+	if (!req->cryptlen && !ctx->fallback)
 		return 0;
 
 	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
-- 
2.17.1