cfg80211: fix scan crash on single-band cards
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>
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 1e7ff94..2936cb8 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -863,7 +863,8 @@
}
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);