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

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>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 6dd5bd95236a..094710519477 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1851,6 +1851,8 @@ 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;