nvmet-auth: use kmemdup instead of kmalloc + memcpy

For code neat purpose, we can use kmemdup to replace
kmalloc + memcpy.

Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c
index c851814d6cb0ffec1c6237438220f89e321d3734..ebdf9aa8104199c8b296ba302af9115c31b22a73 100644 (file)
--- a/drivers/nvme/target/fabrics-cmd-auth.c
+++ b/drivers/nvme/target/fabrics-cmd-auth.c
@@ -160,10 +160,10 @@ static u16 nvmet_auth_reply(struct nvmet_req *req, void *d)
        pr_debug("%s: ctrl %d qid %d host authenticated\n",
                 __func__, ctrl->cntlid, req->sq->qid);
        if (data->cvalid) {
-               req->sq->dhchap_c2 = kmalloc(data->hl, GFP_KERNEL);
+               req->sq->dhchap_c2 = kmemdup(data->rval + data->hl, data->hl,
+                                            GFP_KERNEL);
                if (!req->sq->dhchap_c2)
                        return NVME_AUTH_DHCHAP_FAILURE_FAILED;
-               memcpy(req->sq->dhchap_c2, data->rval + data->hl, data->hl);
 
                pr_debug("%s: ctrl %d qid %d challenge %*ph\n",
                         __func__, ctrl->cntlid, req->sq->qid, data->hl,