Re: [dpdk-dev] [PATCH] vhost: check vhost message header size read

[Tiwei Bie <tiwei.bie@intel.com>]

On Thu, Jan 16, 2020 at 11:44:44AM +0100, Maxime Coquelin wrote:
> This patch adds a check to ensure the read size of
> the Vhost-user message header is not smaller than
> the expected size.
> 
> Fixes: 8f972312b8f4 ("vhost: support vhost-user")
> Cc: stable@dpdk.org
> 
> Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  lib/librte_vhost/vhost_user.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index 69b84a8820..0b7d1e288e 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -2440,8 +2440,12 @@ read_vhost_message(int sockfd, struct VhostUserMsg *msg)
>  
>  	ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
>  		msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num);
> -	if (ret <= 0)
> +	if (ret <= 0) {
>  		return ret;
> +	} else if (ret != VHOST_USER_HDR_SIZE) {
> +		VHOST_LOG_CONFIG(ERR, "Unexpected header size read\n");
> +		return -1;

It's better to close the potential fds in msg->fds[]
e.g. by calling close_msg_fds(msg).

Regards,
Tiwei

> +	}
>  
>  	if (msg->size) {
>  		if (msg->size > sizeof(msg->payload)) {
> -- 
> 2.21.0
>