thr3ads.net - Linux Virtualization - [PATCH net] vhost_net: examine pointer types during un-producing [Mar 2018]

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Jason Wang

2018-Mar-09 03:16 UTC

[PATCH net] vhost_net: examine pointer types during un-producing

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 at redhat.com>
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
 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

Michael S. Tsirkin

2018-Mar-09 03:54 UTC

head link

[PATCH net] vhost_net: examine pointer types during un-producing

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 at redhat.com>
> Signed-off-by: Jason Wang <jasowang at redhat.com>
Acked-by: Michael S. Tsirkin <mst at redhat.com>
> ---
>  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

Jason Wang

2018-Mar-09 06:21 UTC

head link

[PATCH net] vhost_net: examine pointer types during un-producing

On 2018?03?09? 11:16, 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")
Oops, the commit is wrong, let me repost.

Thanks
> Reported-by: Michael S. Tsirkin <mst at redhat.com>
> Signed-off-by: Jason Wang <jasowang at redhat.com>
> ---
>   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 */

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