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authorPhil Blundell <philb@gnu.org>2010-11-24 11:49:19 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-12-09 13:24:21 -0800
commitb13ca1096cc1e5563fbf551d4ffb27798e0d731e (patch)
tree31c94a5d6bb43361fa3e50fa990d6577030a162f
parent1ee97ce543460d963911ca8d0b8461ba7b48846d (diff)
econet: disallow NULL remote addr for sendmsg(), fixes CVE-2010-3849
commit fa0e846494792e722d817b9d3d625a4ef4896c96 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/econet/af_econet.c26
1 files changed, 8 insertions, 18 deletions
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 9aae86ff25a4..2b6c4dc29acf 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -296,23 +296,14 @@ 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];
@@ -350,7 +341,6 @@ 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;