cfg80211: Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE

Buffer overread may happen as nl80211_set_station() reads 4 bytes
from the attribute NL80211_ATTR_LOCAL_MESH_POWER_MODE without
validating the size of data received when userspace sends less
than 4 bytes of data with NL80211_ATTR_LOCAL_MESH_POWER_MODE.
Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE to avoid
the buffer overread.

Fixes: 3b1c5a5307f ("{cfg,nl}80211: mesh power mode primitives and userspace access")
Cc: stable@vger.kernel.org
Signed-off-by: Srinivas Dasari <dasaris@qti.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a2c93bfb9668d433027eb0175649075b8f1f5fae..59f1ea5a83ef019ee3215f8ce4b94232d2def930 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -347,6 +347,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
        [NL80211_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
        [NL80211_ATTR_P2P_CTWINDOW] = { .type = NLA_U8 },
        [NL80211_ATTR_P2P_OPPPS] = { .type = NLA_U8 },
+       [NL80211_ATTR_LOCAL_MESH_POWER_MODE] = {. type = NLA_U32 },
        [NL80211_ATTR_ACL_POLICY] = {. type = NLA_U32 },
        [NL80211_ATTR_MAC_ADDRS] = { .type = NLA_NESTED },
        [NL80211_ATTR_STA_CAPABILITY] = { .type = NLA_U16 },