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authorPatrick McHardy <kaber@trash.net>2007-05-03 03:27:01 -0700
committerDavid S. Miller <davem@davemloft.net>2007-05-03 03:27:01 -0700
commit188ccb5583b8f501e1d0f5ba4f056afa141694e7 (patch)
tree3df30fcc6e333048517e79a3ec3a49b98617f447
parent3f660d66dfbc13ea4b61d3865851b348444c24b4 (diff)
[NETLINK]: Fix use after free in netlink_recvmsg
When the user passes in MSG_TRUNC the skb is used after getting freed. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/netlink/af_netlink.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 7fc6b4da4f0..ac1ceadf4ed 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1246,16 +1246,14 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
siocb->scm = &scm;
}
siocb->scm->creds = *NETLINK_CREDS(skb);
+ if (flags & MSG_TRUNC)
+ copied = skb->len;
skb_free_datagram(sk, skb);
if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2)
netlink_dump(sk);
scm_recv(sock, msg, siocb->scm, flags);
-
- if (flags & MSG_TRUNC)
- copied = skb->len;
-
out:
netlink_rcv_wake(sk);
return err ? : copied;