diff options
| author | Arik Nemtsov <arik@wizery.com> | 2012-06-03 23:32:32 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-06-04 15:26:54 -0400 |
| commit | 794454ce72a298de6f4536ade597bdcc7dcde7c7 (patch) | |
| tree | ab62bbcb9bb3ea3009bcc15c445e9477da7128c5 /net/mac80211 | |
| parent | 69aaedd3cfd23b2c732e3cf1227370a35f5c89d4 (diff) | |
| download | linux-794454ce72a298de6f4536ade597bdcc7dcde7c7.tar.gz linux-794454ce72a298de6f4536ade597bdcc7dcde7c7.tar.bz2 linux-794454ce72a298de6f4536ade597bdcc7dcde7c7.zip | |
mac80211: fix non RCU-safe sta_list manipulation
sta_info_cleanup locks the sta_list using rcu_read_lock however
the delete operation isn't rcu safe. A race between sta_info_cleanup
timer being called and a STA being removed can occur which leads
to a panic while traversing sta_list. Fix this by switching to the
RCU-safe versions.
Cc: stable@vger.kernel.org
Reported-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/sta_info.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index f5b1638fbf80..de455f8bbb91 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -378,7 +378,7 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) /* make the station visible */ sta_info_hash_add(local, sta); - list_add(&sta->list, &local->sta_list); + list_add_rcu(&sta->list, &local->sta_list); set_sta_flag(sta, WLAN_STA_INSERTED); @@ -688,7 +688,7 @@ int __must_check __sta_info_destroy(struct sta_info *sta) if (ret) return ret; - list_del(&sta->list); + list_del_rcu(&sta->list); mutex_lock(&local->key_mtx); for (i = 0; i < NUM_DEFAULT_KEYS; i++) |