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Commit 79cf2dfa authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: clean up key freeing a bit 



When a key is allocated but not really added, there's no
need to go through the entire teardown process. Also, if
adding a key fails, ieee80211_key_link() can take care of
freeing it instead of the (only) caller.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 3d5839b6

net/mac80211/cfg.c

+1 −3
Original line number Diff line number Diff line
@@ -175,7 +175,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev, 
		 *       add it to the device after the station.

		 */

		if (!sta || !test_sta_flag(sta, WLAN_STA_ASSOC)) {

			ieee80211_key_free(sdata->local, key);

			ieee80211_key_free_unused(key);

			err = -ENOENT;

			goto out_unlock;

		}
@@ -214,8 +214,6 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev, 
	}



	err = ieee80211_key_link(key, sdata, sta);

	if (err)

		ieee80211_key_free(sdata->local, key);



 out_unlock:

	mutex_unlock(&sdata->local->sta_mtx);

net/mac80211/key.c

+19 −13
Original line number Diff line number Diff line
@@ -397,6 +397,15 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 
	return key;

}



static void ieee80211_key_free_common(struct ieee80211_key *key)

{

	if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)

		ieee80211_aes_key_free(key->u.ccmp.tfm);

	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)

		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);

	kfree(key);

}



static void __ieee80211_key_destroy(struct ieee80211_key *key,

				    bool delay_tailroom)

{
@@ -412,10 +421,6 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key, 
	if (key->local)

		ieee80211_key_disable_hw_accel(key);



	if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)

		ieee80211_aes_key_free(key->u.ccmp.tfm);

	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)

		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);

	if (key->local) {

		struct ieee80211_sub_if_data *sdata = key->sdata;
@@ -431,7 +436,13 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key, 
		}

	}



	kfree(key);

	ieee80211_key_free_common(key);

}



void ieee80211_key_free_unused(struct ieee80211_key *key)

{

	WARN_ON(key->sdata || key->local);

	ieee80211_key_free_common(key);

}



int ieee80211_key_link(struct ieee80211_key *key,
@@ -469,6 +480,9 @@ int ieee80211_key_link(struct ieee80211_key *key, 


	ret = ieee80211_key_enable_hw_accel(key);



	if (ret)

		__ieee80211_key_free(key, true);



	mutex_unlock(&sdata->local->key_mtx);



	return ret;
@@ -489,14 +503,6 @@ void __ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 
	__ieee80211_key_destroy(key, delay_tailroom);

}



void ieee80211_key_free(struct ieee80211_local *local,

			struct ieee80211_key *key)

{

	mutex_lock(&local->key_mtx);

	__ieee80211_key_free(key, true);

	mutex_unlock(&local->key_mtx);

}



void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)

{

	struct ieee80211_key *key;

net/mac80211/key.h

+5 −6
Original line number Diff line number Diff line
@@ -129,14 +129,13 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 
					  size_t seq_len, const u8 *seq);

/*

 * Insert a key into data structures (sdata, sta if necessary)

 * to make it used, free old key.

 * to make it used, free old key. On failure, also free the new key.

 */

int __must_check ieee80211_key_link(struct ieee80211_key *key,

int ieee80211_key_link(struct ieee80211_key *key,

		       struct ieee80211_sub_if_data *sdata,

		       struct sta_info *sta);

void __ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);

void ieee80211_key_free(struct ieee80211_local *local,

			struct ieee80211_key *key);

void ieee80211_key_free_unused(struct ieee80211_key *key);

void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,

			       bool uni, bool multi);

void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,