From cc0b6fe88e99096868bdbacbf486c97299533b5a Mon Sep 17 00:00:00 2001
From: "Luis R. Rodriguez" <lrodriguez@atheros.com>
Date: Fri, 20 Mar 2009 23:53:05 -0400
Subject: [PATCH] cfg80211: fix incorrect assumption on last_request for 11d
The incorrect assumption is the last regulatory request
(last_request) is always a country IE when processing
country IEs. Although this is true 99% of the time the
first time this happens this could not be true.
This fixes an oops in the branch check for the last_request
when accessing drv_last_ie. The access was done under the
assumption the struct won't be null.
Note to stable: to port to 29 replace as follows, only 29 has
country IE code:
s|NL80211_REGDOM_SET_BY_COUNTRY_IE|REGDOM_SET_BY_COUNTRY_IE
Cc: stable@kernel.org
Reported-by: Quentin Armitage <Quentin@armitage.org.uk>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
net/wireless/reg.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index ead9dccb54751..9afc9168748b8 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1601,6 +1601,10 @@ static bool reg_same_country_ie_hint(struct wiphy *wiphy,
assert_cfg80211_lock();
+ if (unlikely(last_request->initiator !=
+ NL80211_REGDOM_SET_BY_COUNTRY_IE))
+ return false;
+
request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
if (!request_wiphy)
@@ -1663,7 +1667,9 @@ void regulatory_hint_11d(struct wiphy *wiphy,
* we optimize an early check to exit out early if we don't have to
* do anything
*/
- if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
+ if (likely(last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy_idx_valid(last_request->wiphy_idx))) {
struct cfg80211_registered_device *drv_last_ie;
drv_last_ie =
--
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