diff options
| author | Phil Blundell <philb@gnu.org> | 2010-11-24 11:49:19 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-24 11:49:19 -0800 |
| commit | fa0e846494792e722d817b9d3d625a4ef4896c96 (patch) | |
| tree | 0e842037f9f48fe0974fe854f7f2d13b69f23c7f | |
| parent | c39508d6f118308355468314ff414644115a07f3 (diff) | |
| download | linux-fa0e846494792e722d817b9d3d625a4ef4896c96.tar.gz linux-fa0e846494792e722d817b9d3d625a4ef4896c96.tar.bz2 linux-fa0e846494792e722d817b9d3d625a4ef4896c96.zip | |
econet: disallow NULL remote addr for sendmsg(), fixes CVE-2010-3849
Later parts of econet_sendmsg() rely on saddr != NULL, so return early
with EINVAL if NULL was passed otherwise an oops may occur.
Signed-off-by: Phil Blundell <philb@gnu.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/econet/af_econet.c | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c index f8c1ae4b41f0..e366f1bef91f 100644 --- a/net/econet/af_econet.c +++ b/net/econet/af_econet.c @@ -297,23 +297,14 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock, mutex_lock(&econet_mutex); - if (saddr == NULL) { - struct econet_sock *eo = ec_sk(sk); - - addr.station = eo->station; - addr.net = eo->net; - port = eo->port; - cb = eo->cb; - } else { - if (msg->msg_namelen < sizeof(struct sockaddr_ec)) { - mutex_unlock(&econet_mutex); - return -EINVAL; - } - addr.station = saddr->addr.station; - addr.net = saddr->addr.net; - port = saddr->port; - cb = saddr->cb; - } + if (saddr == NULL || msg->msg_namelen < sizeof(struct sockaddr_ec)) { + mutex_unlock(&econet_mutex); + return -EINVAL; + } + addr.station = saddr->addr.station; + addr.net = saddr->addr.net; + port = saddr->port; + cb = saddr->cb; /* Look for a device with the right network number. */ dev = net2dev_map[addr.net]; @@ -351,7 +342,6 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock, eb = (struct ec_cb *)&skb->cb; - /* BUG: saddr may be NULL */ eb->cookie = saddr->cookie; eb->sec = *saddr; eb->sent = ec_tx_done; |