On Wed, Dec 16, 2020 at 3:26 AM wangyunjian <wangyunjian@xxxxxxxxxx> wrote:
>
> From: Yunjian Wang <wangyunjian@xxxxxxxxxx>
>
> Currently the vhost_zerocopy_callback() maybe be called to decrease
> the refcount when sendmsg fails in tun. The error handling in vhost
> handle_tx_zerocopy() will try to decrease the same refcount again.
> This is wrong. To fix this issue, we only call vhost_net_ubuf_put()
> when vq->heads[nvq->desc].len == VHOST_DMA_IN_PROGRESS.
>
> Fixes: 0690899b4d45 ("tun: experimental zero copy tx support")
>
> Signed-off-by: Yunjian Wang <wangyunjian@xxxxxxxxxx>
Acked-by: Willem de Bruijn <willemb@xxxxxxxxxx>
for next time: it's not customary to have an empty line between Fixes
and Signed-off-by
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