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Merge branch 'macsec-fixes' 

Sabrina Dubroca says:

====================
macsec: a few fixes

Some small fixes for the macsec driver:
 - possible NULL pointer dereferences
 - netlink dumps fixes: RTNL locking, consistent dumps
 - a reference counting bug
 - wrong name for uapi constant
 - a few memory leaks

Patches 1 to 5 are the same as in v1, patches 6 to 9 are new.
Patch 6 fixes the memleak that Lance spotted in v1.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-04-24 14:32:05 -04:00
parent 3d05a06d31 4b1fb9352f
commit b6742cab0d
2 changed files with 44 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/net/macsec.c
View File

@ -880,12 +880,12 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
macsec_skb_cb(skb)->valid = false;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return NULL;
return ERR_PTR(-ENOMEM);
req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
if (!req) {
kfree_skb(skb);
return NULL;
return ERR_PTR(-ENOMEM);
}
hdr = (struct macsec_eth_header *)skb->data;
@ -905,7 +905,7 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
aead_request_free(req);
return NULL;
return ERR_PTR(-ENOMEM);
}
} else {
/* integrity only: all headers + data authenticated */
@ -921,14 +921,14 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
dev_hold(dev);
ret = crypto_aead_decrypt(req);
if (ret == -EINPROGRESS) {
return NULL;
return ERR_PTR(ret);
} else if (ret != 0) {
/* decryption/authentication failed
* 10.6 if validateFrames is disabled, deliver anyway
*/
if (ret != -EBADMSG) {
kfree_skb(skb);
skb = NULL;
skb = ERR_PTR(ret);
}
} else {
macsec_skb_cb(skb)->valid = true;
@ -1146,8 +1146,10 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
secy->validate_frames != MACSEC_VALIDATE_DISABLED)
skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
if (!skb) {
macsec_rxsa_put(rx_sa);
if (IS_ERR(skb)) {
/* the decrypt callback needs the reference */
if (PTR_ERR(skb) != -EINPROGRESS)
macsec_rxsa_put(rx_sa);
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
@ -1161,7 +1163,8 @@ deliver:
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
macsec_reset_skb(skb, secy->netdev);
macsec_rxsa_put(rx_sa);
if (rx_sa)
macsec_rxsa_put(rx_sa);
count_rx(dev, skb->len);
rcu_read_unlock();
@ -1622,8 +1625,9 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
}
rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
if (init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len,
secy->icv_len)) {
if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len)) {
kfree(rx_sa);
rtnl_unlock();
return -ENOMEM;
}
@ -1768,6 +1772,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len)) {
kfree(tx_sa);
rtnl_unlock();
return -ENOMEM;
}
@ -2227,7 +2232,8 @@ static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
return 1;
if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
MACSEC_DEFAULT_CIPHER_ID) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
@ -2268,7 +2274,7 @@ static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
if (!hdr)
return -EMSGSIZE;
rtnl_lock();
genl_dump_check_consistent(cb, hdr, &macsec_fam);
if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
goto nla_put_failure;
@ -2429,18 +2435,17 @@ static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
nla_nest_end(skb, rxsc_list);
rtnl_unlock();
genlmsg_end(skb, hdr);
return 0;
nla_put_failure:
rtnl_unlock();
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int macsec_generation = 1; /* protected by RTNL */
static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
@ -2450,6 +2455,10 @@ static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
dev_idx = cb->args[0];
d = 0;
rtnl_lock();
cb->seq = macsec_generation;
for_each_netdev(net, dev) {
struct macsec_secy *secy;
@ -2467,6 +2476,7 @@ next:
}
done:
rtnl_unlock();
cb->args[0] = d;
return skb->len;
}
@ -2920,10 +2930,14 @@ static void macsec_dellink(struct net_device *dev, struct list_head *head)
struct net_device *real_dev = macsec->real_dev;
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
macsec_generation++;
unregister_netdevice_queue(dev, head);
list_del_rcu(&macsec->secys);
if (list_empty(&rxd->secys))
if (list_empty(&rxd->secys)) {
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
}
macsec_del_dev(macsec);
}
@ -2945,8 +2959,10 @@ static int register_macsec_dev(struct net_device *real_dev,
err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
rxd);
if (err < 0)
if (err < 0) {
kfree(rxd);
return err;
}
}
list_add_tail_rcu(&macsec->secys, &rxd->secys);
@ -3066,6 +3082,8 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
if (err < 0)
goto del_dev;
macsec_generation++;
dev_hold(real_dev);
return 0;
@ -3079,7 +3097,7 @@ unregister:
static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
{
u64 csid = DEFAULT_CIPHER_ID;
u64 csid = MACSEC_DEFAULT_CIPHER_ID;
u8 icv_len = DEFAULT_ICV_LEN;
int flag;
bool es, scb, sci;
@ -3094,8 +3112,8 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
switch (csid) {
case DEFAULT_CIPHER_ID:
case DEFAULT_CIPHER_ALT:
case MACSEC_DEFAULT_CIPHER_ID:
case MACSEC_DEFAULT_CIPHER_ALT:
if (icv_len < MACSEC_MIN_ICV_LEN ||
icv_len > MACSEC_MAX_ICV_LEN)
return -EINVAL;
@ -3129,8 +3147,8 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
return -EINVAL;
if ((data[IFLA_MACSEC_PROTECT] &&
nla_get_u8(data[IFLA_MACSEC_PROTECT])) &&
if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
!data[IFLA_MACSEC_WINDOW])
return -EINVAL;
@ -3168,7 +3186,8 @@ static int macsec_fill_info(struct sk_buff *skb,
if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE,
MACSEC_DEFAULT_CIPHER_ID) ||
nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||

4
include/uapi/linux/if_macsec.h
View File

@ -19,8 +19,8 @@
#define MACSEC_MAX_KEY_LEN 128
#define DEFAULT_CIPHER_ID 0x0080020001000001ULL
#define DEFAULT_CIPHER_ALT 0x0080C20001000001ULL
#define MACSEC_DEFAULT_CIPHER_ID 0x0080020001000001ULL
#define MACSEC_DEFAULT_CIPHER_ALT 0x0080C20001000001ULL
#define MACSEC_MIN_ICV_LEN 8
#define MACSEC_MAX_ICV_LEN 32