From d335fe6391c2d86582cf71ef5773a161ee604608 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Sat, 21 Feb 2009 00:04:27 -0500 Subject: [PATCH] cfg80211: protect first access of last_request on 11d hint under mutex We were not protecting last_request there is a small possible race between an 11d hint and another routine which calls reset_regdomains() which can prevent a valid country IE from being processed. This is not critical as it will still be procesed soon after but locking prior to it is correct. Signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- net/wireless/reg.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/wireless/reg.c b/net/wireless/reg.c index d44f3b5481ad..b47445219a48 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -1261,11 +1261,13 @@ void regulatory_hint_11d(struct wiphy *wiphy, u32 checksum = 0; enum environment_cap env = ENVIRON_ANY; - if (!last_request) - return; - mutex_lock(&cfg80211_mutex); + if (unlikely(!last_request)) { + mutex_unlock(&cfg80211_mutex); + return; + } + /* IE len must be evenly divisible by 2 */ if (country_ie_len & 0x01) goto out; -- 2.30.2