From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Thu, 21 Jun 2018 13:11:31 +0800
> Sock will be NULL if we pass -1 to vhost_net_set_backend(), but when
> we meet errors during ubuf allocation, the code does not check for
> NULL before calling sockfd_put(), this will lead NULL
> dereferencing. Fixing by checking sock pointer before.
>
> Fixes: bab632d69ee4 ("vhost: vhost TX zero-copy support")
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Applied and queued up for -stable, thanks Jason.
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