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authorJiri Benc <jbenc@suse.cz>2005-10-10 19:16:53 +0200
committerJeff Garzik <jgarzik@pobox.com>2005-10-18 23:25:36 +0200
commit757d18faee58aa4c43bcaf9a44decf17fa68adeb (patch)
tree307ccb9b815b2b53ad79bb0b0bc5d17a6f39aed0 /net
parentMerge branch 'master' (diff)
downloadlinux-757d18faee58aa4c43bcaf9a44decf17fa68adeb.tar.xz
linux-757d18faee58aa4c43bcaf9a44decf17fa68adeb.zip
[PATCH] ieee80211: division by zero fix
This fixes division by zero bug in ieee80211_wx_get_scan(). Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'net')
-rw-r--r--net/ieee80211/ieee80211_wx.c21
1 files changed, 12 insertions, 9 deletions
diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c
index ee7a70a13250..1ce7af9bec35 100644
--- a/net/ieee80211/ieee80211_wx.c
+++ b/net/ieee80211/ieee80211_wx.c
@@ -152,15 +152,18 @@ static inline char *ipw2100_translate_scan(struct ieee80211_device *ieee,
iwe.u.qual.level = 0;
} else {
iwe.u.qual.level = network->stats.rssi;
- iwe.u.qual.qual =
- (100 *
- (ieee->perfect_rssi - ieee->worst_rssi) *
- (ieee->perfect_rssi - ieee->worst_rssi) -
- (ieee->perfect_rssi - network->stats.rssi) *
- (15 * (ieee->perfect_rssi - ieee->worst_rssi) +
- 62 * (ieee->perfect_rssi - network->stats.rssi))) /
- ((ieee->perfect_rssi - ieee->worst_rssi) *
- (ieee->perfect_rssi - ieee->worst_rssi));
+ if (ieee->perfect_rssi == ieee->worst_rssi)
+ iwe.u.qual.qual = 100;
+ else
+ iwe.u.qual.qual =
+ (100 *
+ (ieee->perfect_rssi - ieee->worst_rssi) *
+ (ieee->perfect_rssi - ieee->worst_rssi) -
+ (ieee->perfect_rssi - network->stats.rssi) *
+ (15 * (ieee->perfect_rssi - ieee->worst_rssi) +
+ 62 * (ieee->perfect_rssi - network->stats.rssi))) /
+ ((ieee->perfect_rssi - ieee->worst_rssi) *
+ (ieee->perfect_rssi - ieee->worst_rssi));
if (iwe.u.qual.qual > 100)
iwe.u.qual.qual = 100;
else if (iwe.u.qual.qual < 1)