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cfg80211: fix scan crash on single-band cards

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commit 58389c69150e6032504dfcd3edca6b1975c8b5bc
Author: Johannes Berg <johannes.berg@intel.com>
Date:   Mon Jul 18 18:08:35 2011 +0200

     cfg80211: allow userspace to control supported rates in scan

made single-band cards crash since it would always
access all wiphy->bands[]. Fix this and reject any
attempts in the new helper ieee80211_get_ratemask()
to do the same, rejecting rates configuration for
unsupported bands.

Reported-by: Pavel Roskin <proski@gnu.org>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-07-20 00:52:16 +02:00 • committed by John W. Linville
parent 70126f6105
commit a401d2bb36
3 changed files with 8 additions and 2 deletions
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4
net/wireless/nl80211.c
View file

@ -3454,7 +3454,9 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
}
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
request->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
if (wiphy->bands[i])
request->rates[i] =
(1 << wiphy->bands[i]->n_bitrates) - 1;
if (info->attrs[NL80211_ATTR_SCAN_SUPP_RATES]) {
nla_for_each_nested(attr,

3
net/wireless/scan.c
View file

@ -863,7 +863,8 @@ int cfg80211_wext_siwscan(struct net_device *dev,
}
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
if (wiphy->bands[i])
creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
rdev->scan_req = creq;
err = rdev->ops->scan(wiphy, dev, creq);

3
net/wireless/util.c
View file

@ -1013,6 +1013,9 @@ int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
{
int i, j;
if (!sband)
return -EINVAL;
if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
return -EINVAL;