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 <steffen@hurrle.net>
Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index eab17eb..aab4948 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -608,7 +608,7 @@
{
struct sock *sk = sock->sk;
struct tipc_port *tport = tipc_sk_port(sk);
- struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
int needs_conn;
long timeo;
int res = -EINVAL;
@@ -736,7 +736,7 @@
{
struct sock *sk = sock->sk;
struct tipc_port *tport = tipc_sk_port(sk);
- struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
int res = -EINVAL;
long timeo;
@@ -906,7 +906,7 @@
*/
static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
{
- struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
if (addr) {
addr->family = AF_TIPC;