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Diffstat (limited to 'net/nfc/llcp_commands.c')
-rw-r--r--net/nfc/llcp_commands.c114
1 files changed, 66 insertions, 48 deletions
diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index 367d8c027101..e2680a3bef79 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -1,18 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2011 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
@@ -27,7 +15,7 @@
#include "nfc.h"
#include "llcp.h"
-static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
+static const u8 llcp_tlv_length[LLCP_TLV_MAX] = {
0,
1, /* VERSION */
2, /* MIUX */
@@ -41,7 +29,7 @@ static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
};
-static u8 llcp_tlv8(u8 *tlv, u8 type)
+static u8 llcp_tlv8(const u8 *tlv, u8 type)
{
if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
return 0;
@@ -49,7 +37,7 @@ static u8 llcp_tlv8(u8 *tlv, u8 type)
return tlv[2];
}
-static u16 llcp_tlv16(u8 *tlv, u8 type)
+static u16 llcp_tlv16(const u8 *tlv, u8 type)
{
if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
return 0;
@@ -58,37 +46,37 @@ static u16 llcp_tlv16(u8 *tlv, u8 type)
}
-static u8 llcp_tlv_version(u8 *tlv)
+static u8 llcp_tlv_version(const u8 *tlv)
{
return llcp_tlv8(tlv, LLCP_TLV_VERSION);
}
-static u16 llcp_tlv_miux(u8 *tlv)
+static u16 llcp_tlv_miux(const u8 *tlv)
{
return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
}
-static u16 llcp_tlv_wks(u8 *tlv)
+static u16 llcp_tlv_wks(const u8 *tlv)
{
return llcp_tlv16(tlv, LLCP_TLV_WKS);
}
-static u16 llcp_tlv_lto(u8 *tlv)
+static u16 llcp_tlv_lto(const u8 *tlv)
{
return llcp_tlv8(tlv, LLCP_TLV_LTO);
}
-static u8 llcp_tlv_opt(u8 *tlv)
+static u8 llcp_tlv_opt(const u8 *tlv)
{
return llcp_tlv8(tlv, LLCP_TLV_OPT);
}
-static u8 llcp_tlv_rw(u8 *tlv)
+static u8 llcp_tlv_rw(const u8 *tlv)
{
return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
}
-u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
+u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length)
{
u8 *tlv, length;
@@ -142,13 +130,17 @@ struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
return sdres;
}
-struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
+struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
size_t uri_len)
{
struct nfc_llcp_sdp_tlv *sdreq;
pr_debug("uri: %s, len: %zu\n", uri, uri_len);
+ /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */
+ if (WARN_ON_ONCE(uri_len > U8_MAX - 4))
+ return NULL;
+
sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
if (sdreq == NULL)
return NULL;
@@ -198,9 +190,10 @@ void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
}
int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
- u8 *tlv_array, u16 tlv_array_len)
+ const u8 *tlv_array, u16 tlv_array_len)
{
- u8 *tlv = tlv_array, type, length, offset = 0;
+ const u8 *tlv = tlv_array;
+ u8 type, length, offset = 0;
pr_debug("TLV array length %d\n", tlv_array_len);
@@ -247,9 +240,10 @@ int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
}
int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
- u8 *tlv_array, u16 tlv_array_len)
+ const u8 *tlv_array, u16 tlv_array_len)
{
- u8 *tlv = tlv_array, type, length, offset = 0;
+ const u8 *tlv = tlv_array;
+ u8 type, length, offset = 0;
pr_debug("TLV array length %d\n", tlv_array_len);
@@ -303,7 +297,7 @@ static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
return pdu;
}
-static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
+static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv,
u8 tlv_length)
{
/* XXX Add an skb length check */
@@ -343,8 +337,6 @@ int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
struct nfc_dev *dev;
struct nfc_llcp_local *local;
- pr_debug("Sending DISC\n");
-
local = sock->local;
if (local == NULL)
return -ENODEV;
@@ -367,8 +359,7 @@ int nfc_llcp_send_symm(struct nfc_dev *dev)
struct sk_buff *skb;
struct nfc_llcp_local *local;
u16 size = 0;
-
- pr_debug("Sending SYMM\n");
+ int err;
local = nfc_llcp_find_local(dev);
if (local == NULL)
@@ -378,8 +369,10 @@ int nfc_llcp_send_symm(struct nfc_dev *dev)
size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
skb = alloc_skb(size, GFP_KERNEL);
- if (skb == NULL)
- return -ENOMEM;
+ if (skb == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
@@ -389,23 +382,26 @@ int nfc_llcp_send_symm(struct nfc_dev *dev)
nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
- return nfc_data_exchange(dev, local->target_idx, skb,
+ err = nfc_data_exchange(dev, local->target_idx, skb,
nfc_llcp_recv, local);
+out:
+ nfc_llcp_local_put(local);
+ return err;
}
int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
{
struct nfc_llcp_local *local;
struct sk_buff *skb;
- u8 *service_name_tlv = NULL, service_name_tlv_length;
- u8 *miux_tlv = NULL, miux_tlv_length;
- u8 *rw_tlv = NULL, rw_tlv_length, rw;
+ const u8 *service_name_tlv = NULL;
+ const u8 *miux_tlv = NULL;
+ const u8 *rw_tlv = NULL;
+ u8 service_name_tlv_length = 0;
+ u8 miux_tlv_length, rw_tlv_length, rw;
int err;
u16 size = 0;
__be16 miux;
- pr_debug("Sending CONNECT\n");
-
local = sock->local;
if (local == NULL)
return -ENODEV;
@@ -415,6 +411,10 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
sock->service_name,
sock->service_name_len,
&service_name_tlv_length);
+ if (!service_name_tlv) {
+ err = -ENOMEM;
+ goto error_tlv;
+ }
size += service_name_tlv_length;
}
@@ -425,9 +425,17 @@ int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
&miux_tlv_length);
+ if (!miux_tlv) {
+ err = -ENOMEM;
+ goto error_tlv;
+ }
size += miux_tlv_length;
rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
+ if (!rw_tlv) {
+ err = -ENOMEM;
+ goto error_tlv;
+ }
size += rw_tlv_length;
pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
@@ -461,14 +469,13 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
{
struct nfc_llcp_local *local;
struct sk_buff *skb;
- u8 *miux_tlv = NULL, miux_tlv_length;
- u8 *rw_tlv = NULL, rw_tlv_length, rw;
+ const u8 *miux_tlv = NULL;
+ const u8 *rw_tlv = NULL;
+ u8 miux_tlv_length, rw_tlv_length, rw;
int err;
u16 size = 0;
__be16 miux;
- pr_debug("Sending CC\n");
-
local = sock->local;
if (local == NULL)
return -ENODEV;
@@ -480,9 +487,17 @@ int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
&miux_tlv_length);
+ if (!miux_tlv) {
+ err = -ENOMEM;
+ goto error_tlv;
+ }
size += miux_tlv_length;
rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
+ if (!rw_tlv) {
+ err = -ENOMEM;
+ goto error_tlv;
+ }
size += rw_tlv_length;
skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
@@ -748,11 +763,14 @@ int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
pr_debug("Fragment %zd bytes remaining %zd",
frag_len, remaining_len);
- pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
+ pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, 0,
frag_len + LLCP_HEADER_SIZE, &err);
if (pdu == NULL) {
- pr_err("Could not allocate PDU\n");
- continue;
+ pr_err("Could not allocate PDU (error=%d)\n", err);
+ len -= remaining_len;
+ if (len == 0)
+ len = err;
+ break;
}
pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
generated by cgit (git 2.34.1) at 2025-12-24 22:27:47 +0000