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authorDan Aloni <dan@aloni.org>2009-06-20 16:32:22 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-07-12 13:21:45 -0700
commit02c8baecf5d8850dba40b47cdf003ed2e04e66dd (patch)
tree78cb75f4d14bb25c72893e66da5a6c1d94a13924 /drivers/staging
parent77b9288197b6034c44abe2619aff62cba056a713 (diff)
Staging: prevent rtl8187se from crashing dev_ioctl() in SIOCGIWNAME
I repeatedly get __stack_chk_fail panic()s with this driver before applying the attached fix. ieee80211_wx_get_name() ignores sizeof(wrqu->name) which is IFNAMSIZ (16), and on certain conditions, the concatenated string will be larger than IFNAMSIZ including the terminating zero. length ("802.11" ++ "b" ++ "/g" ++ " linked" ++ "\x00") == 17 This fix uses strl{cpy,cat} in addition to the reduction of the total possible length of the output string by a char. It can be applied to 2.6.30-stable as well. Signed-off-by: Dan Aloni <dan@aloni.org> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/rtl8187se/ieee80211/ieee80211_softmac_wx.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/staging/rtl8187se/ieee80211/ieee80211_softmac_wx.c b/drivers/staging/rtl8187se/ieee80211/ieee80211_softmac_wx.c
index 93af37e2d31a..54b4b718f84a 100644
--- a/drivers/staging/rtl8187se/ieee80211/ieee80211_softmac_wx.c
+++ b/drivers/staging/rtl8187se/ieee80211/ieee80211_softmac_wx.c
@@ -461,19 +461,19 @@ int ieee80211_wx_get_name(struct ieee80211_device *ieee,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
- strcpy(wrqu->name, "802.11");
+ strlcpy(wrqu->name, "802.11", IFNAMSIZ);
if(ieee->modulation & IEEE80211_CCK_MODULATION){
- strcat(wrqu->name, "b");
+ strlcat(wrqu->name, "b", IFNAMSIZ);
if(ieee->modulation & IEEE80211_OFDM_MODULATION)
- strcat(wrqu->name, "/g");
+ strlcat(wrqu->name, "/g", IFNAMSIZ);
}else if(ieee->modulation & IEEE80211_OFDM_MODULATION)
- strcat(wrqu->name, "g");
+ strlcat(wrqu->name, "g", IFNAMSIZ);
if((ieee->state == IEEE80211_LINKED) ||
(ieee->state == IEEE80211_LINKED_SCANNING))
- strcat(wrqu->name," linked");
+ strlcat(wrqu->name," link", IFNAMSIZ);
else if(ieee->state != IEEE80211_NOLINK)
- strcat(wrqu->name," link..");
+ strlcat(wrqu->name," .....", IFNAMSIZ);
return 0;