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authorMax Stepanov <Max.Stepanov@intel.com>2014-07-09 16:55:32 +0300
committerJohannes Berg <johannes.berg@intel.com>2014-07-21 12:34:08 +0200
commitaeb136c5b433377324f030b1a50b96eb7a99193b (patch)
treecbebda7a6a91bf5e6edc4b48ad3cbe29977288e1 /net/mac80211/wpa.c
parentfa96aabb6a34eeb86ce6a5e1a3914fe9f106cfcc (diff)
mac80211: fix a potential NULL access in ieee80211_crypto_hw_decrypt
The NULL pointer access could happen when ieee80211_crypto_hw_decrypt is called from ieee80211_rx_h_decrypt with the following condition: 1. rx->key->conf.cipher is not WEP, CCMP, TKIP or AES_CMAC 2. rx->sta is NULL When ieee80211_crypto_hw_decrypt is called, it verifies rx->sta->cipher_scheme and it will cause Oops if rx->sta is NULL. This path adds an addirional rx->sta == NULL verification in ieee80211_crypto_hw_decrypt for this case. Signed-off-by: Max Stepanov <Max.Stepanov@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/wpa.c')
-rw-r--r--net/mac80211/wpa.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 9b3dcc201145..f7d4ca4c46e0 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -811,7 +811,7 @@ ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
ieee80211_rx_result
ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
{
- if (rx->sta->cipher_scheme)
+ if (rx->sta && rx->sta->cipher_scheme)
return ieee80211_crypto_cs_decrypt(rx);
return RX_DROP_UNUSABLE;