[PATCH v4 07/14] crypto: caam - check zero-length input

[Iuliana Prodan]

Check zero-length input, for skcipher algorithm, to solve the extra
tests. This is a valid operation, therefore the API will return no error.

Signed-off-by: Iuliana Prodan <iuliana.pro...@nxp.com>
Reviewed-by: Horia Geanta <horia.gea...@nxp.com>
---
 drivers/crypto/caam/caamalg.c     | 6 ++++++
 drivers/crypto/caam/caamalg_qi.c  | 3 +++
 drivers/crypto/caam/caamalg_qi2.c | 5 +++++
 3 files changed, 14 insertions(+)

diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index 47e61c0..9f83b55 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -1884,6 +1884,9 @@ static int skcipher_encrypt(struct skcipher_request *req)
        u32 *desc;
        int ret = 0;
 
+       if (!req->cryptlen)
+               return 0;
+
        /* allocate extended descriptor */
        edesc = skcipher_edesc_alloc(req, DESC_JOB_IO_LEN * CAAM_CMD_SZ);
        if (IS_ERR(edesc))
@@ -1918,6 +1921,9 @@ static int skcipher_decrypt(struct skcipher_request *req)
        u32 *desc;
        int ret = 0;
 
+       if (!req->cryptlen)
+               return 0;
+
        /* allocate extended descriptor */
        edesc = skcipher_edesc_alloc(req, DESC_JOB_IO_LEN * CAAM_CMD_SZ);
        if (IS_ERR(edesc))
diff --git a/drivers/crypto/caam/caamalg_qi.c b/drivers/crypto/caam/caamalg_qi.c
index 794d155d..5ba620d 100644
--- a/drivers/crypto/caam/caamalg_qi.c
+++ b/drivers/crypto/caam/caamalg_qi.c
@@ -1445,6 +1445,9 @@ static inline int skcipher_crypt(struct skcipher_request 
*req, bool encrypt)
        struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
        int ret;
 
+       if (!req->cryptlen)
+               return 0;
+
        if (unlikely(caam_congested))
                return -EAGAIN;
 
diff --git a/drivers/crypto/caam/caamalg_qi2.c 
b/drivers/crypto/caam/caamalg_qi2.c
index 5fd6529..d5f6517 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -1498,6 +1498,9 @@ static int skcipher_encrypt(struct skcipher_request *req)
        struct caam_request *caam_req = skcipher_request_ctx(req);
        int ret;
 
+       if (!req->cryptlen)
+               return 0;
+
        /* allocate extended descriptor */
        edesc = skcipher_edesc_alloc(req);
        if (IS_ERR(edesc))
@@ -1526,6 +1529,8 @@ static int skcipher_decrypt(struct skcipher_request *req)
        struct caam_request *caam_req = skcipher_request_ctx(req);
        int ret;
 
+       if (!req->cryptlen)
+               return 0;
        /* allocate extended descriptor */
        edesc = skcipher_edesc_alloc(req);
        if (IS_ERR(edesc))
-- 
2.1.0