[PATCH] tipc: validate length of sockaddr in connect() for dgram/rdm

[Sasha Levin <sasha.levin@oracle.com>]

Commit f2f8036 ("tipc: add support for connect() on dgram/rdm sockets")
hasn't validated user input length for the sockaddr structure which allows
a user to overwrite kernel memory with arbitrary input.

Fixes: f2f8036 ("tipc: add support for connect() on dgram/rdm sockets")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 net/tipc/socket.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 73c2f51..986dc96 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1852,6 +1852,8 @@ static int tipc_connect(struct socket *sock, struct sockaddr *dest,
 		if (dst->family == AF_UNSPEC) {
 			memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc));
 			tsk->connected = 0;
+		} else if (destlen != sizeof(struct sockaddr_tipc)) {
+			res = -EINVAL;
 		} else {
 			memcpy(&tsk->remote, dest, destlen);
 			tsk->connected = 1;
-- 
1.7.10.4