[dpdk-stable] [dpdk-dev] [PATCH v2] examples/vhost: fix memory leak on forwarding packets

[Yang, YvonneX]

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Wenwu Ma
> Sent: Friday, August 27, 2021 10:01 PM
> To: dev at dpdk.org
> Cc: maxime.coquelin at redhat.com; Xia, Chenbo <chenbo.xia at intel.com>;
> Jiang, Cheng1 <cheng1.jiang at intel.com>; Hu, Jiayu <jiayu.hu at intel.com>;
> Ma, WenwuX <wenwux.ma at intel.com>; stable at dpdk.org
> Subject: [dpdk-dev] [PATCH v2] examples/vhost: fix memory leak on
> forwarding packets
>
> In function virtio_tx_local(), when the device receiving the packet is the
> same as the device to which the packet is forwarded, or the device is
> removed, we return but not free the packet, it will cause a memory leak.
>
> Fixes: 4796ad63ba1f ("examples/vhost: import userspace vhost application")
> Cc: stable at dpdk.org
>
> v2:
> - Delete '.' in the title.
>
> Signed-off-by: Wenwu Ma <wenwux.ma at intel.com>
> ---
>  examples/vhost/main.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/examples/vhost/main.c b/examples/vhost/main.c index
> bc3d71c898..07fd90ec64 100644
> --- a/examples/vhost/main.c
> +++ b/examples/vhost/main.c
> @@ -965,6 +965,7 @@ virtio_tx_local(struct vhost_dev *vdev, struct
> rte_mbuf *m)
>               return -1;
>
>       if (vdev->vid == dst_vdev->vid) {
> +             rte_pktmbuf_free(m);
>               RTE_LOG_DP(DEBUG, VHOST_DATA,
>                       "(%d) TX: src and dst MAC is same. Dropping
> packet.\n",
>                       vdev->vid);
> @@ -975,6 +976,7 @@ virtio_tx_local(struct vhost_dev *vdev, struct
> rte_mbuf *m)
>               "(%d) TX: MAC address is local\n", dst_vdev->vid);
>
>       if (unlikely(dst_vdev->remove)) {
> +             rte_pktmbuf_free(m);
>               RTE_LOG_DP(DEBUG, VHOST_DATA,
>                       "(%d) device is marked for removal\n", dst_vdev-
> >vid);
>               return 0;
> --
> 2.25.1

Tested-by: Yvonne Yang <yvonnex.yang at intel.com>