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| author | Johannes Berg <johannes.berg@intel.com> | 2012-07-05 21:37:05 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2012-07-06 08:33:04 +0200 |
| commit | 135792ec246ddd0b2738dd95447297ea0b91943b (patch) | |
| tree | 1fb1e5ac0b2e5f2cc5f39dd98a1695b68839e9ea | |
| parent | 95ddc1fc4519ed48ddc7d622bd5c84dff3eebb0a (diff) | |
| download | linux-stable-135792ec246ddd0b2738dd95447297ea0b91943b.tar.gz linux-stable-135792ec246ddd0b2738dd95447297ea0b91943b.tar.bz2 linux-stable-135792ec246ddd0b2738dd95447297ea0b91943b.zip | |
mac80211: fix debugfs default key links
Due to the way the default key links are created,
it happens that a link is left dangling:
* both unicast/multicast links are created
* unicast link is destroyed, and the links
are updated
* during this update, adding the multicast
link again fails because it is present,
destroying the debugfs pointer
* removing the multicast link won't work as
the pointer has been destroyed
Fix this by always removing the links and then
re-creating them if needed.
Reported-by: Marek Lindner <lindner_marek@yahoo.de>
Reported-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/debugfs_key.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c index 7932767bb482..090d08ff22c4 100644 --- a/net/mac80211/debugfs_key.c +++ b/net/mac80211/debugfs_key.c @@ -283,6 +283,11 @@ void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata) lockdep_assert_held(&sdata->local->key_mtx); + if (sdata->debugfs.default_unicast_key) { + debugfs_remove(sdata->debugfs.default_unicast_key); + sdata->debugfs.default_unicast_key = NULL; + } + if (sdata->default_unicast_key) { key = key_mtx_dereference(sdata->local, sdata->default_unicast_key); @@ -290,9 +295,11 @@ void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata) sdata->debugfs.default_unicast_key = debugfs_create_symlink("default_unicast_key", sdata->debugfs.dir, buf); - } else { - debugfs_remove(sdata->debugfs.default_unicast_key); - sdata->debugfs.default_unicast_key = NULL; + } + + if (sdata->debugfs.default_multicast_key) { + debugfs_remove(sdata->debugfs.default_multicast_key); + sdata->debugfs.default_multicast_key = NULL; } if (sdata->default_multicast_key) { @@ -302,9 +309,6 @@ void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata) sdata->debugfs.default_multicast_key = debugfs_create_symlink("default_multicast_key", sdata->debugfs.dir, buf); - } else { - debugfs_remove(sdata->debugfs.default_multicast_key); - sdata->debugfs.default_multicast_key = NULL; } } |