[dpdk-dev] [PATCH] vhost: fix buffer length calculation

[Bruce Richardson]

On Thu, Jul 19, 2018 at 11:37:31AM +0800, Tiwei Bie wrote:
> On Tue, Jul 17, 2018 at 09:10:35PM +0800, Tiwei Bie wrote:
> > Fixes: fd68b4739d2c ("vhost: use buffer vectors in dequeue path")
> > 
> > Reported-by: Yinan Wang <yinan.wang at intel.com>
> > Signed-off-by: Tiwei Bie <tiwei.bie at intel.com>
> 
> Applied to dpdk-next-virtio/master, thanks.

It would be great to get this patch into main tree ASAP, since meson build
with gcc 8 is currently broken on master. [Using Fedora 28].

../lib/librte_vhost/virtio_net.c: In function ‘rte_vhost_enqueue_burst’:
cc1: error: ‘__builtin_memcpy’ forming offset [13, 64] is out of the bounds [0, 12] of object ‘tmp_hdr’ with type ‘struct virtio_net_hdr_mrg_rxbuf’ [-Werror=array-bounds]
../lib/librte_vhost/virtio_net.c:636:34: note: ‘tmp_hdr’ declared here
  struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
                                  ^~~~~~~
cc1: error: ‘__builtin_memcpy’ forming offset [13, 64] is out of the bounds [0, 12] of object ‘tmp_hdr’ with type ‘struct virtio_net_hdr_mrg_rxbuf’ [-Werror=array-bounds]
../lib/librte_vhost/virtio_net.c:636:34: note: ‘tmp_hdr’ declared here
cc1: all warnings being treated as errors
ninja: build stopped: subcommand failed.

Regards,
/Bruce