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/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 20ef748..d58f76b 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1413,7 +1413,7 @@
static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
int *msg_namelen)
{
- struct sockaddr_l2 *la = (struct sockaddr_l2 *) msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
memset(la, 0, sizeof(struct sockaddr_l2));
la->l2_family = AF_BLUETOOTH;