[PATCH 11/15] smb: client: Drop 'allocate_crypto' arg from smb*_calc_signature()

[Eric Biggers]

Since the crypto library API is now being used instead of crypto_shash,
all structs for MAC computation are now just fixed-size structs
allocated on the stack; no dynamic allocations are ever required.
Besides being much more efficient, this also means that the
'allocate_crypto' argument to smb2_calc_signature() and
smb3_calc_signature() is no longer used.  Remove this unused argument.

Signed-off-by: Eric Biggers <ebiggers at kernel.org>
---
 fs/smb/client/smb2transport.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c
index 0176185a1efc..41009039b4cb 100644
--- a/fs/smb/client/smb2transport.c
+++ b/fs/smb/client/smb2transport.c
@@ -202,12 +202,11 @@ smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32  tid)
 
 	return tcon;
 }
 
 static int
-smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
-		    bool allocate_crypto)
+smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 {
 	int rc;
 	unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
 	struct kvec *iov = rqst->rq_iov;
 	struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
@@ -438,12 +437,11 @@ generate_smb311signingkey(struct cifs_ses *ses,
 
 	return generate_smb3signingkey(ses, server, &triplet);
 }
 
 static int
-smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
-		    bool allocate_crypto)
+smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 {
 	int rc;
 	unsigned char smb3_signature[SMB2_CMACAES_SIZE];
 	struct kvec *iov = rqst->rq_iov;
 	struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
@@ -451,11 +449,11 @@ smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 	struct aes_cmac_ctx cmac_ctx;
 	struct smb_rqst drqst;
 	u8 key[SMB3_SIGN_KEY_SIZE];
 
 	if (server->vals->protocol_id <= SMB21_PROT_ID)
-		return smb2_calc_signature(rqst, server, allocate_crypto);
+		return smb2_calc_signature(rqst, server);
 
 	rc = smb3_get_sign_key(le64_to_cpu(shdr->SessionId), server, key);
 	if (unlikely(rc)) {
 		cifs_server_dbg(FYI, "%s: Could not get signing key\n", __func__);
 		return rc;
@@ -522,11 +520,11 @@ smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 	if (!is_binding && !server->session_estab) {
 		strscpy(shdr->Signature, "BSRSPYL");
 		return 0;
 	}
 
-	return smb3_calc_signature(rqst, server, false);
+	return smb3_calc_signature(rqst, server);
 }
 
 int
 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 {
@@ -558,11 +556,11 @@ smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 	 */
 	memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
 
 	memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
 
-	rc = smb3_calc_signature(rqst, server, true);
+	rc = smb3_calc_signature(rqst, server);
 
 	if (rc)
 		return rc;
 
 	if (crypto_memneq(server_response_sig, shdr->Signature,
-- 
2.53.0