nl80211: fix HT capability attribute validation

Since the NL80211_ATTR_HT_CAPABILITY attribute is
used as a struct, it needs a minimum, not maximum
length. Enforce that properly. Not doing so could
potentially lead to reading after the buffer.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 48260c2d092a..b587857a9d7d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -132,8 +132,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
         [NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
         [NL80211_ATTR_SUPPORT_MESH_AUTH] = { .type = NLA_FLAG },
 
-        [NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
-                                         .len = NL80211_HT_CAPABILITY_LEN },
+        [NL80211_ATTR_HT_CAPABILITY] = { .len = NL80211_HT_CAPABILITY_LEN },
 
         [NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
         [NL80211_ATTR_IE] = { .type = NLA_BINARY,