[PATCH] crypto: fix memdup.cocci warnings

[Julia Lawall]

From: kbuild test robot <lkp@xxxxxxxxx>

Use kmemdup rather than duplicating its implementation

Generated by: scripts/coccinelle/api/memdup.cocci

Fixes: f08fcced6d00 ("crypto: allwinner - Add sun8i-ss cryptographic offloader")
CC: Corentin Labbe <clabbe.montjoie@xxxxxxxxx>
Signed-off-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: Julia Lawall <julia.lawall@xxxxxxx>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
head:   298b4c604008025b134bc6fccbc4018449945d60
commit: f08fcced6d0017c39cb6eccb571290867119d049 [154/163] crypto: allwinner - Add sun8i-ss cryptographic offloader
:::::: branch date: 3 hours ago
:::::: commit date: 3 hours ago

Please take the patch only if it's a positive warning. Thanks!

 sun8i-ss-cipher.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
@@ -398,10 +398,9 @@ int sun8i_ss_aes_setkey(struct crypto_sk
 		kfree(op->key);
 	}
 	op->keylen = keylen;
-	op->key = kmalloc(keylen, GFP_KERNEL | GFP_DMA);
+	op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
 	if (!op->key)
 		return -ENOMEM;
-	memcpy(op->key, key, keylen);

 	crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 	crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
@@ -426,10 +425,9 @@ int sun8i_ss_des3_setkey(struct crypto_s
 		kfree(op->key);
 	}
 	op->keylen = keylen;
-	op->key = kmalloc(keylen, GFP_KERNEL | GFP_DMA);
+	op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
 	if (!op->key)
 		return -ENOMEM;
-	memcpy(op->key, key, keylen);

 	crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 	crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);