xfrm: Check for esn buffer len in xfrm_new_ae

In xfrm_new_ae() we may overwrite the allocated esn replay state
buffer with a wrong size. So check that the new size matches the
original allocated size and return an error if this is not the case.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index fc152d28753c41df6bd7e26becee2b1657a3ace8..ccc4c0c8ef000fd9635f949bc28c6c866f80ca42 100644 (file)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -360,6 +360,23 @@ static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
        return 0;
 }
 
+static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
+                                        struct nlattr *rp)
+{
+       struct xfrm_replay_state_esn *up;
+
+       if (!replay_esn || !rp)
+               return 0;
+
+       up = nla_data(rp);
+
+       if (xfrm_replay_state_esn_len(replay_esn) !=
+                       xfrm_replay_state_esn_len(up))
+               return -EINVAL;
+
+       return 0;
+}
+
 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
                                       struct xfrm_replay_state_esn **preplay_esn,
                                       struct nlattr *rta)
@@ -1766,6 +1783,10 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
        if (x->km.state != XFRM_STATE_VALID)
                goto out;
 
+       err = xfrm_replay_verify_len(x->replay_esn, rp);
+       if (err)
+               goto out;
+
        spin_lock_bh(&x->lock);
        xfrm_update_ae_params(x, attrs);
        spin_unlock_bh(&x->lock);