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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>
This commit is contained in:
Johannes Berg 2012-07-05 21:37:05 +02:00
parent 95ddc1fc45
commit 135792ec24
1 changed files with 10 additions and 6 deletions
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16
net/mac80211/debugfs_key.c
View File

@ -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;
}
}