nl80211: fix MAC address validation

commit e007b857e88097c96c45620bf3b04a4e309053d1 upstream.

MAC addresses have a fixed length. The current
policy allows passing < ETH_ALEN bytes, which
might result in reading beyond the buffer.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 3dac76f33b947ceda2b4f566aa1595520c1cb2f1..0c2b8080547f480fe244f2a68c776bd64b99e504 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -83,8 +83,8 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
        [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
        [NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
 
-       [NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
-       [NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
+       [NL80211_ATTR_MAC] = { .len = ETH_ALEN },
+       [NL80211_ATTR_PREV_BSSID] = { .len = ETH_ALEN },
 
        [NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
        [NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,