[dpdk-dev] [PATCH] vhost: fix unintended sign extension in async packed ring

[Xia, Chenbo]

> -----Original Message-----
> From: Jiang, Cheng1 <cheng1.jiang at intel.com>
> Sent: Wednesday, May 12, 2021 10:31 AM
> To: maxime.coquelin at redhat.com; Xia, Chenbo <chenbo.xia at intel.com>
> Cc: dev at dpdk.org; Jiang, Cheng1 <cheng1.jiang at intel.com>
> Subject: [PATCH] vhost: fix unintended sign extension in async packed ring
> 
> Change the variable type in store_dma_desc_info_packed() to fix
> suspicious implicit sign extension.
> 
> Coverity issue: 370608, 370610, 370612
> Fixes: 873e8dad6f49 (vhost: support packed ring in async datapath)

Miss "" here. Will add them when applying.

> 
> Signed-off-by: Cheng Jiang <cheng1.jiang at intel.com>
> ---
>  lib/vhost/virtio_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 9137a9923b..abfd67d38c 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -1491,7 +1491,7 @@ store_dma_desc_info_packed(struct vring_used_elem_packed
> *s_ring,
>  		struct vring_used_elem_packed *d_ring,
>  		uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
>  {
> -	uint16_t elem_size = sizeof(struct vring_used_elem_packed);
> +	size_t elem_size = sizeof(struct vring_used_elem_packed);
> 
>  	if (d_idx + count <= ring_size) {
>  		rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
> --
> 2.29.2

Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>