Commit ffa4629e authored Aug 05, 2017 by Tova Mussai Committed by Johannes Berg Sep 21, 2017

nl80211: return error for invalid center_freq in 40 MHz



When NL80211_ATTR_WIPHY_CHANNEL_TYPE is given, nl80211 would parse the
channel definition the old way, discarding NL80211_ATTR_CENTER_FREQ1,
NL80211_ATTR_CENTER_FREQ2 etc. However, it is possible that user space
added both NL80211_ATTR_WIPHY_CHANNEL_TYPE and NL80211_ATTR_CENTER_FREQ1
or NL80211_ATTR_CENTER_FREQ2 assuming that all settings would be honored.

In such a case, validate that NL80211_ATTR_CENTER_FREQ1 and
NL80211_ATTR_CENTER_FREQ2 values match the channel configuration,
as otherwise user space would assume that the desired configuration was
applied.

For example, when trying to start ap with
NL80211_ATTR_WIPHY_CHANNEL_TYPE = NL80211_CHAN_HT40MINUS,
NL80211_ATTR_WIPHY_FREQ = 5180 and NL80211_ATTR_CENTER_FREQ1 = 5250
without this fix, the ap will start on channel 36 (center_freq1 will be
corrected to 5180).  With this fix, we will throw an error instead.

Signed-off-by: Tova Mussai <tova.mussai@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

parent a7f26d80

net/wireless/nl80211.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -2122,6 +2122,15 @@ static int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
		case NL80211_CHAN_HT40MINUS:
		cfg80211_chandef_create(chandef, chandef->chan,
		chantype);
		/* user input for center_freq is incorrect */
		if (info->attrs[NL80211_ATTR_CENTER_FREQ1] &&
		chandef->center_freq1 != nla_get_u32(
		info->attrs[NL80211_ATTR_CENTER_FREQ1]))
		return -EINVAL;
		/* center_freq2 must be zero */
		if (info->attrs[NL80211_ATTR_CENTER_FREQ2] &&
		nla_get_u32(info->attrs[NL80211_ATTR_CENTER_FREQ2]))
		return -EINVAL;
		break;
		default:
		return -EINVAL;