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-rw-r--r--net/wireless/scan.c212
1 files changed, 136 insertions, 76 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 25e1e1f..ceb8f00 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1239,15 +1239,15 @@ int cfg80211_wext_siwscan(struct net_device *dev,
}
EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
-static void ieee80211_scan_add_ies(struct iw_request_info *info,
- const struct cfg80211_bss_ies *ies,
- char **current_ev, char *end_buf)
+static char *ieee80211_scan_add_ies(struct iw_request_info *info,
+ const struct cfg80211_bss_ies *ies,
+ char *current_ev, char *end_buf)
{
const u8 *pos, *end, *next;
struct iw_event iwe;
if (!ies)
- return;
+ return current_ev;
/*
* If needed, fragment the IEs buffer (at IE boundaries) into short
@@ -1264,10 +1264,11 @@ static void ieee80211_scan_add_ies(struct iw_request_info *info,
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = next - pos;
- *current_ev = iwe_stream_add_point(info, *current_ev,
- end_buf, &iwe,
- (void *)pos);
-
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
pos = next;
}
@@ -1275,10 +1276,14 @@ static void ieee80211_scan_add_ies(struct iw_request_info *info,
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = end - pos;
- *current_ev = iwe_stream_add_point(info, *current_ev,
- end_buf, &iwe,
- (void *)pos);
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe,
+ (void *)pos);
+ if (IS_ERR(current_ev))
+ return current_ev;
}
+
+ return current_ev;
}
static char *
@@ -1289,7 +1294,8 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
const struct cfg80211_bss_ies *ies;
struct iw_event iwe;
const u8 *ie;
- u8 *buf, *cfg, *p;
+ u8 buf[50];
+ u8 *cfg, *p, *tmp;
int rem, i, sig;
bool ismesh = false;
@@ -1297,22 +1303,28 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
- current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
- IW_EV_ADDR_LEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_ADDR_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
iwe.u.freq.e = 0;
- current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
- IW_EV_FREQ_LEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = bss->pub.channel->center_freq;
iwe.u.freq.e = 6;
- current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
- IW_EV_FREQ_LEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+ IW_EV_FREQ_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
memset(&iwe, 0, sizeof(iwe));
@@ -1341,8 +1353,11 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
/* not reached */
break;
}
- current_ev = iwe_stream_add_event(info, current_ev, end_buf,
- &iwe, IW_EV_QUAL_LEN);
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_QUAL_LEN);
+ if (IS_ERR(current_ev))
+ return current_ev;
}
memset(&iwe, 0, sizeof(iwe));
@@ -1352,8 +1367,10 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
iwe.u.data.length = 0;
- current_ev = iwe_stream_add_point(info, current_ev, end_buf,
- &iwe, "");
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, "");
+ if (IS_ERR(current_ev))
+ return current_ev;
rcu_read_lock();
ies = rcu_dereference(bss->pub.ies);
@@ -1371,66 +1388,91 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = ie[1];
iwe.u.data.flags = 1;
- current_ev = iwe_stream_add_point(info, current_ev, end_buf,
- &iwe, (u8 *)ie + 2);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
break;
case WLAN_EID_MESH_ID:
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = ie[1];
iwe.u.data.flags = 1;
- current_ev = iwe_stream_add_point(info, current_ev, end_buf,
- &iwe, (u8 *)ie + 2);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf, &iwe,
+ (u8 *)ie + 2);
+ if (IS_ERR(current_ev))
+ goto unlock;
break;
case WLAN_EID_MESH_CONFIG:
ismesh = true;
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
break;
- buf = kmalloc(50, GFP_ATOMIC);
- if (!buf)
- break;
cfg = (u8 *)ie + 2;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "Mesh Network Path Selection Protocol ID: "
"0x%02X", cfg[0]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Path Selection Metric ID: 0x%02X",
cfg[1]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Congestion Control Mode ID: 0x%02X",
cfg[2]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf,
- &iwe, buf);
- kfree(buf);
+ current_ev = iwe_stream_add_point_check(info,
+ current_ev,
+ end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
break;
case WLAN_EID_SUPP_RATES:
case WLAN_EID_EXT_SUPP_RATES:
@@ -1445,8 +1487,14 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
for (i = 0; i < ie[1]; i++) {
iwe.u.bitrate.value =
((ie[i + 2] & 0x7f) * 500000);
+ tmp = p;
p = iwe_stream_add_value(info, current_ev, p,
- end_buf, &iwe, IW_EV_PARAM_LEN);
+ end_buf, &iwe,
+ IW_EV_PARAM_LEN);
+ if (p == tmp) {
+ current_ev = ERR_PTR(-E2BIG);
+ goto unlock;
+ }
}
current_ev = p;
break;
@@ -1465,31 +1513,35 @@ ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
- current_ev = iwe_stream_add_event(info, current_ev, end_buf,
- &iwe, IW_EV_UINT_LEN);
- }
-
- buf = kmalloc(31, GFP_ATOMIC);
- if (buf) {
- memset(&iwe, 0, sizeof(iwe));
- iwe.cmd = IWEVCUSTOM;
- sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
- iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev, end_buf,
- &iwe, buf);
- memset(&iwe, 0, sizeof(iwe));
- iwe.cmd = IWEVCUSTOM;
- sprintf(buf, " Last beacon: %ums ago",
- elapsed_jiffies_msecs(bss->ts));
- iwe.u.data.length = strlen(buf);
- current_ev = iwe_stream_add_point(info, current_ev,
- end_buf, &iwe, buf);
- kfree(buf);
+ current_ev = iwe_stream_add_event_check(info, current_ev,
+ end_buf, &iwe,
+ IW_EV_UINT_LEN);
+ if (IS_ERR(current_ev))
+ goto unlock;
}
- ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+ &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+ memset(&iwe, 0, sizeof(iwe));
+ iwe.cmd = IWEVCUSTOM;
+ sprintf(buf, " Last beacon: %ums ago",
+ elapsed_jiffies_msecs(bss->ts));
+ iwe.u.data.length = strlen(buf);
+ current_ev = iwe_stream_add_point_check(info, current_ev,
+ end_buf, &iwe, buf);
+ if (IS_ERR(current_ev))
+ goto unlock;
+
+ current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
+
+ unlock:
rcu_read_unlock();
-
return current_ev;
}
@@ -1501,19 +1553,27 @@ static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
char *current_ev = buf;
char *end_buf = buf + len;
struct cfg80211_internal_bss *bss;
+ int err = 0;
spin_lock_bh(&rdev->bss_lock);
cfg80211_bss_expire(rdev);
list_for_each_entry(bss, &rdev->bss_list, list) {
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
- spin_unlock_bh(&rdev->bss_lock);
- return -E2BIG;
+ err = -E2BIG;
+ break;
}
current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
current_ev, end_buf);
+ if (IS_ERR(current_ev)) {
+ err = PTR_ERR(current_ev);
+ break;
+ }
}
spin_unlock_bh(&rdev->bss_lock);
+
+ if (err)
+ return err;
return current_ev - buf;
}
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