diff options
| author | Arik Nemtsov <arik@wizery.com> | 2014-04-21 20:39:34 -0700 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2014-04-22 17:12:55 +0200 |
| commit | c888393b74968aa8795c94b8923a5061b5ce6dcc (patch) | |
| tree | 4e158535df915c7b9f643701f386bbf03bb5182f /net/wireless/reg.c | |
| parent | 4f267c1198cf57fc9fc444c78649bca018cc63af (diff) | |
| download | lwn-c888393b74968aa8795c94b8923a5061b5ce6dcc.tar.gz lwn-c888393b74968aa8795c94b8923a5061b5ce6dcc.zip | |
cfg80211: avoid freeing last_request while in flight
Avoid freeing the last request while it is being processed. This can
happen in some cases if reg_work is kicked for some reason while the
currently pending request is in flight.
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Tested-by: Eliad Peller <eliad@wizery.com>
Tested-by: Colleen Twitty <colleen@cozybit.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/reg.c')
| -rw-r--r-- | net/wireless/reg.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 9d32633f5956..081c5717e3ec 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -263,8 +263,16 @@ static char user_alpha2[2]; module_param(ieee80211_regdom, charp, 0444); MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code"); -static void reg_free_request(struct regulatory_request *lr) +static void reg_free_request(struct regulatory_request *request) { + if (request != get_last_request()) + kfree(request); +} + +static void reg_free_last_request(void) +{ + struct regulatory_request *lr = get_last_request(); + if (lr != &core_request_world && lr) kfree_rcu(lr, rcu_head); } @@ -277,7 +285,7 @@ static void reg_update_last_request(struct regulatory_request *request) if (lr == request) return; - reg_free_request(lr); + reg_free_last_request(); rcu_assign_pointer(last_request, request); } @@ -1661,7 +1669,7 @@ reg_process_hint_user(struct regulatory_request *user_request) if (treatment == REG_REQ_IGNORE || treatment == REG_REQ_ALREADY_SET || treatment == REG_REQ_USER_HINT_HANDLED) { - kfree(user_request); + reg_free_request(user_request); return treatment; } @@ -1722,14 +1730,14 @@ reg_process_hint_driver(struct wiphy *wiphy, break; case REG_REQ_IGNORE: case REG_REQ_USER_HINT_HANDLED: - kfree(driver_request); + reg_free_request(driver_request); return treatment; case REG_REQ_INTERSECT: /* fall through */ case REG_REQ_ALREADY_SET: regd = reg_copy_regd(get_cfg80211_regdom()); if (IS_ERR(regd)) { - kfree(driver_request); + reg_free_request(driver_request); return REG_REQ_IGNORE; } rcu_assign_pointer(wiphy->regd, regd); @@ -1824,10 +1832,10 @@ reg_process_hint_country_ie(struct wiphy *wiphy, case REG_REQ_USER_HINT_HANDLED: /* fall through */ case REG_REQ_ALREADY_SET: - kfree(country_ie_request); + reg_free_request(country_ie_request); return treatment; case REG_REQ_INTERSECT: - kfree(country_ie_request); + reg_free_request(country_ie_request); /* * This doesn't happen yet, not sure we * ever want to support it for this case. @@ -1888,7 +1896,7 @@ static void reg_process_hint(struct regulatory_request *reg_request) return; out_free: - kfree(reg_request); + reg_free_request(reg_request); } /* |