lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 4 Dec 2017 11:25:13 +0000 From: wangyunjian <wangyunjian@...wei.com> To: Jason Wang <jasowang@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: "mst@...hat.com" <mst@...hat.com>, caihe <caihe@...wei.com> Subject: RE: [PATCH net] virtio_net: fix return value check in receive_mergeable() > -----Original Message----- > From: Jason Wang [mailto:jasowang@...hat.com] > Sent: Monday, December 04, 2017 3:10 PM > To: wangyunjian <wangyunjian@...wei.com>; linux- > kernel@...r.kernel.org > Cc: mst@...hat.com; caihe <caihe@...wei.com> > Subject: Re: [PATCH net] virtio_net: fix return value check in > receive_mergeable() > > > > On 2017年12月04日 14:02, wangyunjian wrote: > > From: Yunjian Wang <wangyunjian@...wei.com> > > > > The function virtqueue_get_buf_ctx() could return NULL, the return > > value 'buf' need to be checked with NULL, not value 'ctx'. > > > > Signed-off-by: Yunjian Wang <wangyunjian@...wei.com> > > --- > > drivers/net/virtio_net.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > index 19a985e..559b215 100644 > > --- a/drivers/net/virtio_net.c > > +++ b/drivers/net/virtio_net.c > > @@ -756,7 +756,7 @@ static struct sk_buff *receive_mergeable(struct > net_device *dev, > > int num_skb_frags; > > > > buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); > > - if (unlikely(!ctx)) { > > + if (unlikely(!buf)) { > > pr_debug("%s: rx error: %d buffers out of %d > missing\n", > > dev->name, num_buf, > > virtio16_to_cpu(vi->vdev, > > Hi: > > The path looks good but I'm not sure this is a real fix since we add > data and ctx simultaneously in virtqueue_add_inbuf_ctx(). > > Any bad result you see without this patch? > Now no problem has been found yet, and I found it when reviewing the code. Thanks > Thanks
Powered by blists - more mailing lists