From: Zhu Yi Date: Thu, 19 Jan 2006 08:20:59 +0000 (+0800) Subject: [PATCH] ieee80211: Fix iwlist scan can only show about 20 APs X-Git-Tag: v2.6.16-rc2~250^2~2^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=55cd94aa1df8e575ab3236641d29d63ecdde5012;p=linux-2.6 [PATCH] ieee80211: Fix iwlist scan can only show about 20 APs Limit the amount of output given to iwlist scan. Signed-off-by: Hong Liu Signed-off-by: Zhu Yi Signed-off-by: John W. Linville --- diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c index 23e1630f50..f87c6b89f8 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,