diff options
| author | Steffen Klassert <steffen.klassert@secunet.com> | 2011-03-28 19:47:30 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-28 23:34:52 -0700 |
| commit | e2b19125e94124daaeda1ddcf9b85b04575ad86f (patch) | |
| tree | ee670f037ea5b3826731ea5169f1afe94b925f16 | |
| parent | af2f464e326ebad57284cfdecb03f1606e89bbc7 (diff) | |
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>
| -rw-r--r-- | net/xfrm/xfrm_user.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index fc152d28753..ccc4c0c8ef0 100644 --- 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); |