[PATCH -next] KEYS: trusted: Switch to kmemdup_nul()

[Yang Yingliang]

Use kmemdup_nul() helper instead of open-coding to
simplify the code.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 security/keys/trusted-keys/trusted_tpm1.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 493eb91ed017..90ded4757e79 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -978,11 +978,9 @@ static int trusted_instantiate(struct key *key,
 	if (datalen <= 0 || datalen > 32767 || !prep->data)
 		return -EINVAL;
 
-	datablob = kmalloc(datalen + 1, GFP_KERNEL);
+	datablob = kmemdup_nul(prep->data, datalen, GFP_KERNEL);
 	if (!datablob)
 		return -ENOMEM;
-	memcpy(datablob, prep->data, datalen);
-	datablob[datalen] = '\0';
 
 	options = trusted_options_alloc();
 	if (!options) {
-- 
2.25.1