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mac80211: Fix debugfs union misuse and pointer corruption 

debugfs union in struct ieee80211_sub_if_data is misused by including a
common default_key dentry as a union member. This ends occupying the same
memory area with the first dentry in other union members (structures;
usually drop_unencrypted). Consequently, debugfs operations on
default_key symlinks and drop_unencrypted entry are using the same
dentry pointer even though they are supposed to be separate ones. This
can lead to removing entries incorrectly or potentially leaving
something behind since one of the dentry pointers gets lost.

Fix this by moving the default_key dentry to a new struct
(common_debugfs) that contains dentries (more to be added in future)
that are shared by all vif types. The debugfs union must only be used
for vif type-specific entries to avoid this type of pointer corruption.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-08-28 15:12:06 +03:00 committed by John W. Linville
parent 9a52028e53
commit 2b58b20939
2 changed files with 6 additions and 4 deletions
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6
net/mac80211/debugfs_key.c
View File

@ -265,7 +265,7 @@ void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
key = sdata->default_key;
if (key) {
sprintf(buf, "../keys/%d", key->debugfs.cnt);
sdata->debugfs.default_key =
sdata->common_debugfs.default_key =
debugfs_create_symlink("default_key",
sdata->debugfsdir, buf);
} else
@ -277,8 +277,8 @@ void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
if (!sdata)
return;
debugfs_remove(sdata->debugfs.default_key);
sdata->debugfs.default_key = NULL;
debugfs_remove(sdata->common_debugfs.default_key);
sdata->common_debugfs.default_key = NULL;
}
void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,

4
net/mac80211/ieee80211_i.h
View File

@ -496,8 +496,10 @@ struct ieee80211_sub_if_data {
struct {
struct dentry *mode;
} monitor;
struct dentry *default_key;
} debugfs;
struct {
struct dentry *default_key;
} common_debugfs;
#ifdef CONFIG_MAC80211_MESH
struct dentry *mesh_stats_dir;