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/util.c b/net/wireless/util.c
index a329429..be75a3a 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1013,6 +1013,9 @@
{
int i, j;
+ if (!sband)
+ return -EINVAL;
+
if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
return -EINVAL;