The ->ibss_dfs pointer is always allocated with a user controlled
length. This caused a static checker warning because what if the length
was zero? In that case, any dereference of ->ibss_dfs would lead to an
Oops.
It turns out that this isn't a problem because the ->ibss_dfs pointer is
never used. This patch deletes it along with all the related code. In
particular the entire libipw_network_reset() function can be removed.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ipw2x00/libipw.h b/drivers/net/wireless/ipw2x00/libipw.h
index 5ce2f59..b057161 100644
--- a/drivers/net/wireless/ipw2x00/libipw.h
+++ b/drivers/net/wireless/ipw2x00/libipw.h
@@ -654,10 +654,6 @@ struct libipw_network {
/* TPC Report - mandatory if spctrm mgmt required */
struct libipw_tpc_report tpc_report;
- /* IBSS DFS - mandatory if spctrm mgmt required and IBSS
- * NOTE: This is variable length and so must be allocated dynamically */
- struct libipw_ibss_dfs *ibss_dfs;
-
/* Channel Switch Announcement - optional if spctrm mgmt required */
struct libipw_csa csa;
@@ -970,7 +966,6 @@ int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb,
/* make sure to set stats->len */
void libipw_rx_mgt(struct libipw_device *ieee, struct libipw_hdr_4addr *header,
struct libipw_rx_stats *stats);
-void libipw_network_reset(struct libipw_network *network);
/* libipw_geo.c */
const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee);
diff --git a/drivers/net/wireless/ipw2x00/libipw_module.c b/drivers/net/wireless/ipw2x00/libipw_module.c
index 5f31b72..60f2874 100644
--- a/drivers/net/wireless/ipw2x00/libipw_module.c
+++ b/drivers/net/wireless/ipw2x00/libipw_module.c
@@ -84,25 +84,12 @@ static int libipw_networks_allocate(struct libipw_device *ieee)
return 0;
}
-void libipw_network_reset(struct libipw_network *network)
-{
- if (!network)
- return;
-
- if (network->ibss_dfs) {
- kfree(network->ibss_dfs);
- network->ibss_dfs = NULL;
- }
-}
-
static inline void libipw_networks_free(struct libipw_device *ieee)
{
int i;
- for (i = 0; i < MAX_NETWORK_COUNT; i++) {
- kfree(ieee->networks[i]->ibss_dfs);
+ for (i = 0; i < MAX_NETWORK_COUNT; i++)
kfree(ieee->networks[i]);
- }
}
void libipw_networks_age(struct libipw_device *ieee,
diff --git a/drivers/net/wireless/ipw2x00/libipw_rx.c b/drivers/net/wireless/ipw2x00/libipw_rx.c
index 2d66984..a6877dd 100644
--- a/drivers/net/wireless/ipw2x00/libipw_rx.c
+++ b/drivers/net/wireless/ipw2x00/libipw_rx.c
@@ -1298,13 +1298,6 @@ static int libipw_parse_info_param(struct libipw_info_element
break;
case WLAN_EID_IBSS_DFS:
- if (network->ibss_dfs)
- break;
- network->ibss_dfs = kmemdup(info_element->data,
- info_element->len,
- GFP_ATOMIC);
- if (!network->ibss_dfs)
- return 1;
network->flags |= NETWORK_HAS_IBSS_DFS;
break;
@@ -1335,9 +1328,7 @@ static int libipw_parse_info_param(struct libipw_info_element
static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response
*frame, struct libipw_rx_stats *stats)
{
- struct libipw_network network_resp = {
- .ibss_dfs = NULL,
- };
+ struct libipw_network network_resp = { };
struct libipw_network *network = &network_resp;
struct net_device *dev = ieee->dev;
@@ -1472,9 +1463,6 @@ static void update_network(struct libipw_network *dst,
int qos_active;
u8 old_param;
- libipw_network_reset(dst);
- dst->ibss_dfs = src->ibss_dfs;
-
/* We only update the statistics if they were created by receiving
* the network information on the actual channel the network is on.
*
@@ -1548,9 +1536,7 @@ static void libipw_process_probe_response(struct libipw_device
*stats)
{
struct net_device *dev = ieee->dev;
- struct libipw_network network = {
- .ibss_dfs = NULL,
- };
+ struct libipw_network network = { };
struct libipw_network *target;
struct libipw_network *oldest = NULL;
#ifdef CONFIG_LIBIPW_DEBUG
@@ -1618,7 +1604,6 @@ static void libipw_process_probe_response(struct libipw_device
LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",
target->ssid_len, target->ssid,
target->bssid);
- libipw_network_reset(target);
} else {
/* Otherwise just pull from the free list */
target = list_entry(ieee->network_free_list.next,
@@ -1634,7 +1619,6 @@ static void libipw_process_probe_response(struct libipw_device
"BEACON" : "PROBE RESPONSE");
#endif
memcpy(target, &network, sizeof(*target));
- network.ibss_dfs = NULL;
list_add_tail(&target->list, &ieee->network_list);
} else {
LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",
@@ -1643,7 +1627,6 @@ static void libipw_process_probe_response(struct libipw_device
is_beacon(beacon->header.frame_ctl) ?
"BEACON" : "PROBE RESPONSE");
update_network(target, &network);
- network.ibss_dfs = NULL;
}
spin_unlock_irqrestore(&ieee->lock, flags);
--
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