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-rw-r--r--net/ieee80211/ieee80211_wx.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c
index 23e1630f50b7..f87c6b89f845 100644
--- a/net/ieee80211/ieee80211_wx.c
+++ b/net/ieee80211/ieee80211_wx.c
@@ -232,15 +232,18 @@ static char *ipw2100_translate_scan(struct ieee80211_device *ieee,
return start;
}
+#define SCAN_ITEM_SIZE 128
+
int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
struct ieee80211_network *network;
unsigned long flags;
+ int err = 0;
char *ev = extra;
- char *stop = ev + IW_SCAN_MAX_DATA;
+ char *stop = ev + wrqu->data.length;
int i = 0;
IEEE80211_DEBUG_WX("Getting scan\n");
@@ -249,6 +252,11 @@ int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
list_for_each_entry(network, &ieee->network_list, list) {
i++;
+ if (stop - ev < SCAN_ITEM_SIZE) {
+ err = -E2BIG;
+ break;
+ }
+
if (ieee->scan_age == 0 ||
time_after(network->last_scanned + ieee->scan_age, jiffies))
ev = ipw2100_translate_scan(ieee, ev, stop, network);
@@ -270,7 +278,7 @@ int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
IEEE80211_DEBUG_WX("exit: %d networks returned.\n", i);
- return 0;
+ return err;
}
int ieee80211_wx_set_encode(struct ieee80211_device *ieee,