[PATCH 3/3] smb: client: Use hmac_sha256_zeroize_ctx function to clear hmac_sha256_ctx

[Thomas Huth <thuth@redhat.com>]

It's just cosmetics, but now that we have a helper function for clearing
hmac_sha256_ctx with a __cleanup() statement, we can also use it in the smb
client code for good measure.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 fs/smb/client/smb2transport.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c
index c407f30e00401..080864b24a0c5 100644
--- a/fs/smb/client/smb2transport.c
+++ b/fs/smb/client/smb2transport.c
@@ -212,7 +212,7 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 	unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
 	struct kvec *iov = rqst->rq_iov;
 	struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
-	struct hmac_sha256_ctx hmac_ctx;
+	struct hmac_sha256_ctx hmac_ctx __cleanup(hmac_sha256_zeroize_ctx);
 	struct smb_rqst drqst;
 	__u64 sid = le64_to_cpu(shdr->SessionId);
 	u8 key[SMB2_NTLMV2_SESSKEY_SIZE];
@@ -250,7 +250,6 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 		memcpy(shdr->Signature, smb2_signature, SMB2_SIGNATURE_SIZE);
 
 	memzero_explicit(key, sizeof(key));
-	memzero_explicit(&hmac_ctx, sizeof(hmac_ctx));
 	return rc;
 }
 
-- 
2.55.0