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| author | Jouni Malinen <j@w1.fi> | 2010-07-26 15:52:03 -0700 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-07-27 14:59:58 -0400 |
| commit | 32162a4dab0e6a4ca7f886a01173b5f9b80843be (patch) | |
| tree | a8337e9b9788b787c13241ec9a9642527d5aad6a /net/mac80211/cfg.c | |
| parent | 1b2fb7dc71c1f8f97663c2da84fa1c8183588474 (diff) | |
| download | op-kernel-dev-32162a4dab0e6a4ca7f886a01173b5f9b80843be.zip op-kernel-dev-32162a4dab0e6a4ca7f886a01173b5f9b80843be.tar.gz | |
mac80211: Fix key freeing to handle unlinked keys
Key locking simplification removed key->sdata != NULL verification from
ieee80211_key_free(). While that is fine for most use cases, there is one
path where this function can be called with an unlinked key (i.e.,
key->sdata == NULL && key->local == NULL). This results in a NULL pointer
dereference with the current implementation. This is known to happen at
least with FT protocol when wpa_supplicant tries to configure the key
before association.
Avoid the issue by passing in the local pointer to
ieee80211_key_free(). In addition, do not clear the key from hw_accel
or debugfs if it has not yet been added. At least the hw_accel one could
trigger another NULL pointer dereference.
Signed-off-by: Jouni Malinen <j@w1.fi>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/cfg.c')
| -rw-r--r-- | net/mac80211/cfg.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index b769567..dab6b8e 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -158,7 +158,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev, if (mac_addr) { sta = sta_info_get_bss(sdata, mac_addr); if (!sta) { - ieee80211_key_free(key); + ieee80211_key_free(sdata->local, key); err = -ENOENT; goto out_unlock; } @@ -192,7 +192,7 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev, goto out_unlock; if (sta->key) { - ieee80211_key_free(sta->key); + ieee80211_key_free(sdata->local, sta->key); WARN_ON(sta->key); ret = 0; } @@ -205,7 +205,7 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev, goto out_unlock; } - ieee80211_key_free(sdata->keys[key_idx]); + ieee80211_key_free(sdata->local, sdata->keys[key_idx]); WARN_ON(sdata->keys[key_idx]); ret = 0; |
