) ;
> wangzengyuan ; sta...@dpdk.org
> Subject: Re: [PATCH 1/1] vhost: fix a double fetch when dequeue offloading
>
> On Thu, 19 Dec 2024 14:38:28 +0800
> Yunjian Wang wrote:
>
> > diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> > index 69901ab3b5..5c
On Thu, 19 Dec 2024 14:38:28 +0800
Yunjian Wang wrote:
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 69901ab3b5..5c40ae7069 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -2914,10 +2914,12 @@ desc_to_mbuf(struct virtio_net *dev, struct
> vhost_
> > Cc: dev@dpdk.org; maxime.coque...@redhat.com; chen...@nvidia.com;
> > Lilijun (Jerry) ; xiawei (H)
> > ;
> > wangzengyuan ; sta...@dpdk.org
> > Subject: Re: [PATCH 1/1] vhost: fix a double fetch when dequeue offloading
> >
> > On Thu, 19 Dec 2024 14:38:28
t; wangzengyuan ; sta...@dpdk.org
> Subject: Re: [PATCH 1/1] vhost: fix a double fetch when dequeue offloading
>
> On Thu, 19 Dec 2024 14:38:28 +0800
> Yunjian Wang wrote:
>
> > - hdr = (struct virtio_net_hdr
> > *)((uintptr_t)buf_vec[0].buf_addr);
>
On Thu, 19 Dec 2024 14:38:28 +0800
Yunjian Wang wrote:
> - hdr = (struct virtio_net_hdr
> *)((uintptr_t)buf_vec[0].buf_addr);
> + rte_memcpy((void *)(uintptr_t)&tmp_hdr,
> + (void *)(uintptr_t)buf_vec[0].buf_addr,
> +
> wangzengyuan ; sta...@dpdk.org
> Subject: Re: [PATCH 1/1] vhost: fix a double fetch when dequeue offloading
>
> On Thu, Dec 19, 2024 at 7:38 AM Yunjian Wang
> wrote:
> >
> > The hdr->csum_start does two successive reads from user space to read a
> > variab
On Thu, Dec 19, 2024 at 7:38 AM Yunjian Wang wrote:
>
> The hdr->csum_start does two successive reads from user space to read a
> variable length data structure. The result overflow if the data structure
> changes between the two reads.
>
> To fix this, we can prevent double fetch issue by copying
The hdr->csum_start does two successive reads from user space to read a
variable length data structure. The result overflow if the data structure
changes between the two reads.
To fix this, we can prevent double fetch issue by copying virtio_hdr to
the temporary variable.
Fixes: 4dc4e33ffa10 ("ne
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