1 files changed, 20 insertions, 9 deletions

diff --git a/net/mac80211/wep.c b/net/mac80211/wep.c
index 5f3a4113bda1..9ebc8d8a1f5b 100644
--- a/net/mac80211/wep.c
+++ b/net/mac80211/wep.c
@@ -32,13 +32,16 @@ int ieee80211_wep_init(struct ieee80211_local *local)
 
         local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
                                                 CRYPTO_ALG_ASYNC);
-        if (IS_ERR(local->wep_tx_tfm))
+        if (IS_ERR(local->wep_tx_tfm)) {
+                local->wep_rx_tfm = ERR_PTR(-EINVAL);
                 return PTR_ERR(local->wep_tx_tfm);
+        }
 
         local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
                                                 CRYPTO_ALG_ASYNC);
         if (IS_ERR(local->wep_rx_tfm)) {
                 crypto_free_blkcipher(local->wep_tx_tfm);
+                local->wep_tx_tfm = ERR_PTR(-EINVAL);
                 return PTR_ERR(local->wep_rx_tfm);
         }
 
@@ -47,8 +50,10 @@ int ieee80211_wep_init(struct ieee80211_local *local)
 
 void ieee80211_wep_free(struct ieee80211_local *local)
 {
-        crypto_free_blkcipher(local->wep_tx_tfm);
-        crypto_free_blkcipher(local->wep_rx_tfm);
+        if (!IS_ERR(local->wep_tx_tfm))
+                crypto_free_blkcipher(local->wep_tx_tfm);
+        if (!IS_ERR(local->wep_rx_tfm))
+                crypto_free_blkcipher(local->wep_rx_tfm);
 }
 
 static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
@@ -122,19 +127,24 @@ static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
 /* Perform WEP encryption using given key. data buffer must have tailroom
  * for 4-byte ICV. data_len must not include this ICV. Note: this function
  * does _not_ add IV. data = RC4(data | CRC32(data)) */
-void ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
-                                size_t klen, u8 *data, size_t data_len)
+int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
+                               size_t klen, u8 *data, size_t data_len)
 {
         struct blkcipher_desc desc = { .tfm = tfm };
         struct scatterlist sg;
         __le32 icv;
 
+        if (IS_ERR(tfm))
+                return -1;
+
         icv = cpu_to_le32(~crc32_le(~0, data, data_len));
         put_unaligned(icv, (__le32 *)(data + data_len));
 
         crypto_blkcipher_setkey(tfm, rc4key, klen);
         sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
         crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
+
+        return 0;
 }
 
 
@@ -168,10 +178,8 @@ int ieee80211_wep_encrypt(struct ieee80211_local *local,
         /* Add room for ICV */
         skb_put(skb, WEP_ICV_LEN);
 
-        ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3,
-                                   iv + WEP_IV_LEN, len);
-
-        return 0;
+        return ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3,
+                                          iv + WEP_IV_LEN, len);
 }
 
 
@@ -185,6 +193,9 @@ int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
         struct scatterlist sg;
         __le32 crc;
 
+        if (IS_ERR(tfm))
+                return -1;
+
         crypto_blkcipher_setkey(tfm, rc4key, klen);
         sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
         crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);