On Fri, Mar 09, 2018 at 11:16:22AM +0800, Jason Wang wrote:
> After commit 761876c857cb ("tap: XDP support"), we can actually
> queueing XDP pointers in the pointer ring, so we should examine the
> pointer type before freeing the pointer.
>
> Fixes: 761876c857cb ("tap: XDP support")
> Reported-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> drivers/net/tun.c | 3 ++-
> drivers/vhost/net.c | 2 +-
> include/linux/if_tun.h | 4 ++++
> 3 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 7433bb2..28cfa64 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -655,7 +655,7 @@ static struct tun_struct *tun_enable_queue(struct tun_file *tfile)
> return tun;
> }
>
> -static void tun_ptr_free(void *ptr)
> +void tun_ptr_free(void *ptr)
> {
> if (!ptr)
> return;
> @@ -667,6 +667,7 @@ static void tun_ptr_free(void *ptr)
> __skb_array_destroy_skb(ptr);
> }
> }
> +EXPORT_SYMBOL_GPL(tun_ptr_free);
>
> static void tun_queue_purge(struct tun_file *tfile)
> {
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 610cba2..54a138f 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -170,7 +170,7 @@ static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq)
> if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) {
> ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head,
> vhost_net_buf_get_size(rxq),
> - __skb_array_destroy_skb);
> + tun_ptr_free);
> rxq->head = rxq->tail = 0;
> }
> }
> diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
> index c5b0a75..fd00170 100644
> --- a/include/linux/if_tun.h
> +++ b/include/linux/if_tun.h
> @@ -25,6 +25,7 @@ struct ptr_ring *tun_get_tx_ring(struct file *file);
> bool tun_is_xdp_buff(void *ptr);
> void *tun_xdp_to_ptr(void *ptr);
> void *tun_ptr_to_xdp(void *ptr);
> +void tun_ptr_free(void *ptr);
> #else
> #include <linux/err.h>
> #include <linux/errno.h>
> @@ -50,5 +51,8 @@ static inline void *tun_ptr_to_xdp(void *ptr)
> {
> return NULL;
> }
> +static inline void tun_ptr_free(void *ptr)
> +{
> +}
> #endif /* CONFIG_TUN */
> #endif /* __IF_TUN_H */
> --
> 2.7.4
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