On 11/19/2013 10:03 PM, Eric Dumazet wrote:
> On Tue, 2013-11-19 at 16:05 +0800, Jason Wang wrote:
>> > We need to drop the refcnt of page when we fail to allocate an skb for frag
>> > list, otherwise it will be leaked. The bug was introduced by commit
>> > 2613af0ed18a11d5c566a81f9a6510b73180660a ("virtio_net: migrate mergeable rx
>> > buffers to page frag allocators").
>> >
>> > Cc: Michael Dalton <mwdal...@google.com>
>> > Cc: Eric Dumazet <eduma...@google.com>
>> > Cc: Rusty Russell <ru...@rustcorp.com.au>
>> > Cc: Michael S. Tsirkin <m...@redhat.com>
>> > Signed-off-by: Jason Wang <jasow...@redhat.com>
>> > ---
>> > The patch was needed for 3.12 stable.
> Good catch, but if we return from receive_mergeable() in the 'middle'
> of the frags we would need for the current skb, who will
> call the virtqueue_get_buf() to flush the remaining frags ?
>
> Don't we also need to call virtqueue_get_buf() like
>
> while (--num_buf) {
> buf = virtqueue_get_buf(rq->vq, &len);
> if (!buf)
> break;
> put_page(virt_to_head_page(buf));
> }
>
> ?
Yes we need this, will send V2.
Thanks
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
