From 342dfc306fb32155314dad277f3c3686b83fb9f1 Mon Sep 17 00:00:00 2001 From: Steffen Hurrle Date: Fri, 17 Jan 2014 22:53:15 +0100 Subject: net: add build-time checks for msg->msg_name size This is a follow-up patch to f3d3342602f8bc ("net: rework recvmsg handler msg_name and msg_namelen logic"). DECLARE_SOCKADDR validates that the structure we use for writing the name information to is not larger than the buffer which is reserved for msg->msg_name (which is 128 bytes). Also use DECLARE_SOCKADDR consistently in sendmsg code paths. Signed-off-by: Steffen Hurrle Suggested-by: Hannes Frederic Sowa Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/appletalk/ddp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/appletalk') diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c index 7d424ac6e760..02806c6b2ff3 100644 --- a/net/appletalk/ddp.c +++ b/net/appletalk/ddp.c @@ -1566,7 +1566,7 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr { struct sock *sk = sock->sk; struct atalk_sock *at = at_sk(sk); - struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name); int flags = msg->msg_flags; int loopback = 0; struct sockaddr_at local_satalk, gsat; @@ -1764,7 +1764,7 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); if (!err && msg->msg_name) { - struct sockaddr_at *sat = msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); sat->sat_family = AF_APPLETALK; sat->sat_port = ddp->deh_sport; sat->sat_addr.s_node = ddp->deh_snode; -- cgit v1.2.3