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/decnet/af_decnet.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/decnet') diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c index dd4d506ef923..2954dcbca832 100644 --- a/net/decnet/af_decnet.c +++ b/net/decnet/af_decnet.c @@ -1808,6 +1808,7 @@ out: rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk); if ((rv >= 0) && msg->msg_name) { + __sockaddr_check_size(sizeof(struct sockaddr_dn)); memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn)); msg->msg_namelen = sizeof(struct sockaddr_dn); } @@ -1914,7 +1915,7 @@ static int dn_sendmsg(struct kiocb *iocb, struct socket *sock, int err = 0; size_t sent = 0; int addr_len = msg->msg_namelen; - struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name); struct sk_buff *skb = NULL; struct dn_skb_cb *cb; size_t len; -- cgit