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cfg80211: protect first access of last_request on 11d hint under mutex

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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 <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-02-21 00:04:27 -05:00 committed by John W. Linville
parent 806a9e3967
commit d335fe6391
1 changed files with 5 additions and 3 deletions
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8
net/wireless/reg.c
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@ -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;