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

[Ying Xue <ying.xue@windriver.com>]

On 03/24/2015 03:30 AM, Sasha Levin wrote:
> 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>

> ---
>  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;
>