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authorJohannes Berg <johannes@sipsolutions.net>2008-05-03 01:04:47 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-05-12 21:18:05 -0400
commit78520cad4b222d81fa18f2dcfa52394d8d1722b0 (patch)
tree76f69aafe51620373cb805fd69782ec3970280dd /net
parentd5251aea1539ec89dd567e75169c568b5243b6fa (diff)
mac80211: fix debugfs default key oops
Under certain circumstances (in AP mode) the debugfs function that is supposed to add the default key symlink can encounter a NULL default_key pointer. This patch makes it handle that situtation gracefully. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/debugfs_key.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index 879e7210458..19efc3a6a93 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -255,14 +255,23 @@ void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
+ struct ieee80211_key *key;
if (!sdata->debugfsdir)
return;
- sprintf(buf, "../keys/%d", sdata->default_key->debugfs.cnt);
- sdata->debugfs.default_key =
- debugfs_create_symlink("default_key", sdata->debugfsdir, buf);
+ /* this is running under the key lock */
+
+ key = sdata->default_key;
+ if (key) {
+ sprintf(buf, "../keys/%d", key->debugfs.cnt);
+ sdata->debugfs.default_key =
+ debugfs_create_symlink("default_key",
+ sdata->debugfsdir, buf);
+ } else
+ ieee80211_debugfs_key_remove_default(sdata);
}
+
void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
{
if (!sdata)