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/rds/recv.c | 3 +-- net/rds/send.c | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-) (limited to 'net/rds') diff --git a/net/rds/recv.c b/net/rds/recv.c index de339b24ca14..bd82522534fc 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -402,7 +402,7 @@ int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, struct rds_sock *rs = rds_sk_to_rs(sk); long timeo; int ret = 0, nonblock = msg_flags & MSG_DONTWAIT; - struct sockaddr_in *sin; + DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); struct rds_incoming *inc = NULL; /* udp_recvmsg()->sock_recvtimeo() gets away without locking too.. */ @@ -479,7 +479,6 @@ int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, rds_stats_inc(s_recv_delivered); - sin = (struct sockaddr_in *)msg->msg_name; if (sin) { sin->sin_family = AF_INET; sin->sin_port = inc->i_hdr.h_sport; diff --git a/net/rds/send.c b/net/rds/send.c index 88eace57dd6b..a82fb660ec00 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -922,7 +922,7 @@ int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, { struct sock *sk = sock->sk; struct rds_sock *rs = rds_sk_to_rs(sk); - struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); __be32 daddr; __be16 dport; struct rds_message *rm = NULL; -- cgit v1.2.3