linux-kernel - [ 050/122] iwlwifi: Check BSS ctx active before call mac80211

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Date:	Tue,  7 Aug 2012 15:25:38 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Daniel J Blueman <daniel@...ra.org>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Ilan Peer <ilan.peer@...el.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [ 050/122] iwlwifi: Check BSS ctx active before call mac80211

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilan Peer <ilan.peer@...el.com>

commit e19ebcab01cc130fa832764d453b263460ec3b91 upstream.

It is possible that the BSS context is not active (for example
when the current mode is set to GO), or that the vif->type is
different than station. In such a case we cannot
call mac80211 to report the average rssi for the interface
(the function assumes that the vif is valid and that the type
is station).

Reported-by: Daniel J Blueman <daniel@...ra.org>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Ilan Peer <ilan.peer@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/iwlwifi/iwl-agn-lib.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -617,6 +617,11 @@ static bool iwlagn_fill_txpower_mode(str
 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 	int ave_rssi;
 
+	if (!ctx->vif || (ctx->vif->type != NL80211_IFTYPE_STATION)) {
+		IWL_DEBUG_INFO(priv, "BSS ctx not active or not in sta mode\n");
+		return false;
+	}
+
 	ave_rssi = ieee80211_ave_rssi(ctx->vif);
 	if (!ave_rssi) {
 		/* no rssi data, no changes to reduce tx power */


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