dcbnl: fix various netlink info leaks

[ Upstream commit 29cd8ae0e1a39e239a3a7b67da1986add1199fc0 ]

The dcb netlink interface leaks stack memory in various places:
* perm_addr[] buffer is only filled at max with 12 of the 32 bytes but
  copied completely,
* no in-kernel driver fills all fields of an IEEE 802.1Qaz subcommand,
  so we're leaking up to 58 bytes for ieee_ets structs, up to 136 bytes
  for ieee_pfc structs, etc.,
* the same is true for CEE -- no in-kernel driver fills the whole
  struct,

Prevent all of the above stack info leaks by properly initializing the
buffers/structures involved.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index d860530..2f9517d 100644 (file)
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -336,6 +336,7 @@ static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
        dcb->dcb_family = AF_UNSPEC;
        dcb->cmd = DCB_CMD_GPERM_HWADDR;
 
+       memset(perm_addr, 0, sizeof(perm_addr));
        netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 
        ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
@@ -1238,6 +1239,7 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
 
        if (ops->ieee_getets) {
                struct ieee_ets ets;
+               memset(&ets, 0, sizeof(ets));
                err = ops->ieee_getets(netdev, &ets);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets);
@@ -1245,6 +1247,7 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
 
        if (ops->ieee_getpfc) {
                struct ieee_pfc pfc;
+               memset(&pfc, 0, sizeof(pfc));
                err = ops->ieee_getpfc(netdev, &pfc);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc);
@@ -1277,6 +1280,7 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
        /* get peer info if available */
        if (ops->ieee_peer_getets) {
                struct ieee_ets ets;
+               memset(&ets, 0, sizeof(ets));
                err = ops->ieee_peer_getets(netdev, &ets);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_IEEE_PEER_ETS, sizeof(ets), &ets);
@@ -1284,6 +1288,7 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
 
        if (ops->ieee_peer_getpfc) {
                struct ieee_pfc pfc;
+               memset(&pfc, 0, sizeof(pfc));
                err = ops->ieee_peer_getpfc(netdev, &pfc);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_IEEE_PEER_PFC, sizeof(pfc), &pfc);
@@ -1463,6 +1468,7 @@ static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
        /* peer info if available */
        if (ops->cee_peer_getpg) {
                struct cee_pg pg;
+               memset(&pg, 0, sizeof(pg));
                err = ops->cee_peer_getpg(netdev, &pg);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_CEE_PEER_PG, sizeof(pg), &pg);
@@ -1470,6 +1476,7 @@ static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
 
        if (ops->cee_peer_getpfc) {
                struct cee_pfc pfc;
+               memset(&pfc, 0, sizeof(pfc));
                err = ops->cee_peer_getpfc(netdev, &pfc);
                if (!err)
                        NLA_PUT(skb, DCB_ATTR_CEE_PEER_PFC, sizeof(pfc), &pfc);