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vhost_net: examine pointer types during un-producing

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After commit fc72d1d54d ("tuntap: XDP transmission"), we can
actually queueing XDP pointers in the pointer ring, so we should
examine the pointer type before freeing the pointer.

Fixes: fc72d1d54d ("tuntap: XDP transmission")
Reported-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2018-03-09 14:50:34 +08:00 committed by David S. Miller
parent 303fd71b37
commit 3a4030761e
3 changed files with 7 additions and 2 deletions
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3
drivers/net/tun.c
View File

@ -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)
{

2
drivers/vhost/net.c
View File

@ -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;
}
}

4
include/linux/if_tun.h
View File

@ -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 */