smb: client: allocate crypto only for primary server

For extra channels, point ->secmech.{enc,dec} to the primary
server ones.

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: ematsumiya

fs/smb/client/cifsencrypt.c

@@ -735,13 +735,18 @@ cifs_crypto_secmech_release(struct TCP_Server_Info *server)
 	cifs_free_hash(&server->secmech.sha512);
 	cifs_free_hash(&server->secmech.hmacmd5);
 
-	if (server->secmech.enc) {
-		crypto_free_aead(server->secmech.enc);
-		server->secmech.enc = NULL;
-	}
+	if (!SERVER_IS_CHAN(server)) {
+		if (server->secmech.enc) {
+			crypto_free_aead(server->secmech.enc);
+			server->secmech.enc = NULL;
+		}
 
-	if (server->secmech.dec) {
-		crypto_free_aead(server->secmech.dec);
+		if (server->secmech.dec) {
+			crypto_free_aead(server->secmech.dec);
+			server->secmech.dec = NULL;
+		}
+	} else {
+		server->secmech.enc = NULL;
 		server->secmech.dec = NULL;
 	}
 }

fs/smb/client/smb2pdu.c

@@ -1268,9 +1268,13 @@ SMB2_negotiate(const unsigned int xid,
 	}
 
 	if (server->cipher_type && !rc) {
-		rc = smb3_crypto_aead_allocate(server);
-		if (rc)
-			cifs_server_dbg(VFS, "%s: crypto alloc failed, rc=%d\n", __func__, rc);
+		if (!SERVER_IS_CHAN(server)) {
+			rc = smb3_crypto_aead_allocate(server);
+		} else {
+			/* For channels, just reuse the primary server crypto secmech. */
+			server->secmech.enc = server->primary_server->secmech.enc;
+			server->secmech.dec = server->primary_server->secmech.dec;
+		}
 	}
 neg_exit:
 	free_rsp_buf(resp_buftype, rsp);