mac80211: Don't squash error codes in key setup functions

ieee80211_add_key() currently returns -ENOMEM in case of any error,
including a missing crypto algorithm.  Change ieee80211_key_alloc()
and ieee80211_aes_{key_setup_encrypt,cmac_key_setup}() to encode
errors with ERR_PTR() rather than returning NULL, and change
ieee80211_add_key() accordingly.

Compile-tested only.

Reported-by: Marcin Owsiany <porridge@debian.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 29ac8e1a509e..19c6146010b7 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -150,8 +150,8 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
 
         key = ieee80211_key_alloc(alg, key_idx, params->key_len, params->key,
                                   params->seq_len, params->seq);
-        if (!key)
-                return -ENOMEM;
+        if (IS_ERR(key))
+                return PTR_ERR(key);
 
         mutex_lock(&sdata->local->sta_mtx);