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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/net/nfc/llcp_commands.c
....@@ -1,18 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Copyright (C) 2011  Intel Corporation. All rights reserved.
3
- *
4
- * This program is free software; you can redistribute it and/or modify
5
- * it under the terms of the GNU General Public License as published by
6
- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
8
- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, see <http://www.gnu.org/licenses/>.
164  */
175 
186 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
....@@ -27,7 +15,7 @@
2715 #include "nfc.h"
2816 #include "llcp.h"
2917 
30
-static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
18
+static const u8 llcp_tlv_length[LLCP_TLV_MAX] = {
3119 	0,
3220 	1, /* VERSION */
3321 	2, /* MIUX */
....@@ -41,7 +29,7 @@
4129 
4230 };
4331 
44
-static u8 llcp_tlv8(u8 *tlv, u8 type)
32
+static u8 llcp_tlv8(const u8 *tlv, u8 type)
4533 {
4634 	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
4735 		return 0;
....@@ -49,7 +37,7 @@
4937 	return tlv[2];
5038 }
5139 
52
-static u16 llcp_tlv16(u8 *tlv, u8 type)
40
+static u16 llcp_tlv16(const u8 *tlv, u8 type)
5341 {
5442 	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
5543 		return 0;
....@@ -58,37 +46,37 @@
5846 }
5947 
6048 
61
-static u8 llcp_tlv_version(u8 *tlv)
49
+static u8 llcp_tlv_version(const u8 *tlv)
6250 {
6351 	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
6452 }
6553 
66
-static u16 llcp_tlv_miux(u8 *tlv)
54
+static u16 llcp_tlv_miux(const u8 *tlv)
6755 {
6856 	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
6957 }
7058 
71
-static u16 llcp_tlv_wks(u8 *tlv)
59
+static u16 llcp_tlv_wks(const u8 *tlv)
7260 {
7361 	return llcp_tlv16(tlv, LLCP_TLV_WKS);
7462 }
7563 
76
-static u16 llcp_tlv_lto(u8 *tlv)
64
+static u16 llcp_tlv_lto(const u8 *tlv)
7765 {
7866 	return llcp_tlv8(tlv, LLCP_TLV_LTO);
7967 }
8068 
81
-static u8 llcp_tlv_opt(u8 *tlv)
69
+static u8 llcp_tlv_opt(const u8 *tlv)
8270 {
8371 	return llcp_tlv8(tlv, LLCP_TLV_OPT);
8472 }
8573 
86
-static u8 llcp_tlv_rw(u8 *tlv)
74
+static u8 llcp_tlv_rw(const u8 *tlv)
8775 {
8876 	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
8977 }
9078 
91
-u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
79
+u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length)
9280 {
9381 	u8 *tlv, length;
9482 
....@@ -142,7 +130,7 @@
142130 	return sdres;
143131 }
144132 
145
-struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
133
+struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
146134 						  size_t uri_len)
147135 {
148136 	struct nfc_llcp_sdp_tlv *sdreq;
....@@ -202,9 +190,10 @@
202190 }
203191 
204192 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
205
-			  u8 *tlv_array, u16 tlv_array_len)
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+			  const u8 *tlv_array, u16 tlv_array_len)
206194 {
207
-	u8 *tlv = tlv_array, type, length, offset = 0;
195
+	const u8 *tlv = tlv_array;
196
+	u8 type, length, offset = 0;
208197 
209198 	pr_debug("TLV array length %d\n", tlv_array_len);
210199 
....@@ -251,9 +240,10 @@
251240 }
252241 
253242 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
254
-				  u8 *tlv_array, u16 tlv_array_len)
243
+				  const u8 *tlv_array, u16 tlv_array_len)
255244 {
256
-	u8 *tlv = tlv_array, type, length, offset = 0;
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+	const u8 *tlv = tlv_array;
246
+	u8 type, length, offset = 0;
257247 
258248 	pr_debug("TLV array length %d\n", tlv_array_len);
259249 
....@@ -307,7 +297,7 @@
307297 	return pdu;
308298 }
309299 
310
-static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
300
+static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv,
311301 				    u8 tlv_length)
312302 {
313303 	/* XXX Add an skb length check */
....@@ -371,6 +361,7 @@
371361 	struct sk_buff *skb;
372362 	struct nfc_llcp_local *local;
373363 	u16 size = 0;
364
+	int err;
374365 
375366 	pr_debug("Sending SYMM\n");
376367 
....@@ -382,8 +373,10 @@
382373 	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
383374 
384375 	skb = alloc_skb(size, GFP_KERNEL);
385
-	if (skb == NULL)
386
-		return -ENOMEM;
376
+	if (skb == NULL) {
377
+		err = -ENOMEM;
378
+		goto out;
379
+	}
387380 
388381 	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
389382 
....@@ -393,17 +386,22 @@
393386 
394387 	nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
395388 
396
-	return nfc_data_exchange(dev, local->target_idx, skb,
389
+	err = nfc_data_exchange(dev, local->target_idx, skb,
397390 				 nfc_llcp_recv, local);
391
+out:
392
+	nfc_llcp_local_put(local);
393
+	return err;
398394 }
399395 
400396 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
401397 {
402398 	struct nfc_llcp_local *local;
403399 	struct sk_buff *skb;
404
-	u8 *service_name_tlv = NULL, service_name_tlv_length;
405
-	u8 *miux_tlv = NULL, miux_tlv_length;
406
-	u8 *rw_tlv = NULL, rw_tlv_length, rw;
400
+	const u8 *service_name_tlv = NULL;
401
+	const u8 *miux_tlv = NULL;
402
+	const u8 *rw_tlv = NULL;
403
+	u8 service_name_tlv_length = 0;
404
+	u8 miux_tlv_length,  rw_tlv_length, rw;
407405 	int err;
408406 	u16 size = 0;
409407 	__be16 miux;
....@@ -477,8 +475,9 @@
477475 {
478476 	struct nfc_llcp_local *local;
479477 	struct sk_buff *skb;
480
-	u8 *miux_tlv = NULL, miux_tlv_length;
481
-	u8 *rw_tlv = NULL, rw_tlv_length, rw;
478
+	const u8 *miux_tlv = NULL;
479
+	const u8 *rw_tlv = NULL;
480
+	u8 miux_tlv_length, rw_tlv_length, rw;
482481 	int err;
483482 	u16 size = 0;
484483 	__be16 miux;