Commit a1ca7a12 authored by Dariusz Stojaczyk's avatar Dariusz Stojaczyk Committed by Ben Walker
Browse files

virtio: fix enqueuing zero-length descriptor chains 



Previous descriptor chain was being corrupted
by setting invalid vq->req_end (virtio.c:538).

Change-Id: I4b27db02dc990e6af011a1b614e30e3050379e9f
Signed-off-by: default avatarDariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/392774


Reviewed-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
Tested-by: default avatarSPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
parent a58611d5

lib/virtio/virtio.c

+2 −1
Original line number Diff line number Diff line
@@ -511,7 +511,8 @@ virtqueue_req_add_iovs(struct virtqueue *vq, struct iovec *iovs, uint16_t iovcnt 
	 * or the caller specifies SPDK_VIRTIO_DESC_F_INDIRECT

	 */



	prev_head = new_head = vq->vq_desc_head_idx;

	prev_head = vq->req_end;

	new_head = vq->vq_desc_head_idx;

	for (i = 0; i < iovcnt; ++i) {

		desc = &vq->vq_ring.desc[new_head];