NFC: NCI: Fix max length of General Bytes in ATR_RES

The maximum size of ATR_REQ and ATR_RES is 64 bytes.
The maximum number of General Bytes is calculated by
the maximum number of data bytes in the ATR_REQ/ATR_RES,
substracted by the number of mandatory data bytes.

ATR_REQ: 16 mandatory data bytes, giving a maximum of
48 General Bytes.
ATR_RES: 17 mandatory data bytes, giving a maximum of
47 General Bytes.

Regression introduced in commit a99903ec.

Signed-off-by: Julien Lefrique <lefrique@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

include/uapi/linux/nfc.h

@@ -205,6 +205,8 @@ enum nfc_sdp_attr {
 #define NFC_SENSF_RES_MAXSIZE		18
 #define NFC_ATR_REQ_MAXSIZE		64
 #define NFC_ATR_RES_MAXSIZE		64
+#define NFC_ATR_REQ_GB_MAXSIZE		48
+#define NFC_ATR_RES_GB_MAXSIZE		47
 #define NFC_GB_MAXSIZE			48
 #define NFC_FIRMWARE_NAME_MAXSIZE	32
 #define NFC_ISO15693_UID_MAXSIZE	8

net/nfc/nci/ntf.c

@@ -479,24 +479,22 @@ static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
 	switch (ntf->activation_rf_tech_and_mode) {
 	case NCI_NFC_A_PASSIVE_POLL_MODE:
 	case NCI_NFC_F_PASSIVE_POLL_MODE:
-		/* ATR_RES general bytes at offset 15 */
 		ndev->remote_gb_len = min_t(__u8,
 			(ntf->activation_params.poll_nfc_dep.atr_res_len
 						- NFC_ATR_RES_GT_OFFSET),
-			NFC_MAX_GT_LEN);
+			NFC_ATR_RES_GB_MAXSIZE);
 		memcpy(ndev->remote_gb,
-		       (ntf->activation_params.poll_nfc_dep .atr_res
+		       (ntf->activation_params.poll_nfc_dep.atr_res
 						+ NFC_ATR_RES_GT_OFFSET),
 		       ndev->remote_gb_len);
 		break;
 
 	case NCI_NFC_A_PASSIVE_LISTEN_MODE:
 	case NCI_NFC_F_PASSIVE_LISTEN_MODE:
-		/* ATR_REQ general bytes at offset 14 */
 		ndev->remote_gb_len = min_t(__u8,
 			(ntf->activation_params.listen_nfc_dep.atr_req_len
 						- NFC_ATR_REQ_GT_OFFSET),
-			NFC_MAX_GT_LEN);
+			NFC_ATR_REQ_GB_MAXSIZE);
 		memcpy(ndev->remote_gb,
 		       (ntf->activation_params.listen_nfc_dep.atr_req
 						+ NFC_ATR_REQ_GT_OFFSET),