On Tue, 2013-04-09 at 17:16 +0800, Asias He wrote:
> If we fail to submit the allocated tv_vmd to tcm_vhost_submission_work,
> we will leak the tv_vmd. Free tv_vmd on fail path.
>
> Signed-off-by: Asias He <as...@redhat.com>
> ---
> drivers/vhost/tcm_vhost.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
> index 3351ed3..1f9116c 100644
> --- a/drivers/vhost/tcm_vhost.c
> +++ b/drivers/vhost/tcm_vhost.c
> @@ -860,7 +860,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
> vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
> " bytes, out: %d, in: %d\n",
> vq->iov[out].iov_len, out, in);
> - break;
> + goto err;
> }
>
> tv_cmd->tvc_resp = vq->iov[out].iov_base;
> @@ -882,7 +882,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
> " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
> scsi_command_size(tv_cmd->tvc_cdb),
> TCM_VHOST_MAX_CDB_SIZE);
> - break; /* TODO */
> + goto err;
> }
> tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
>
> @@ -895,7 +895,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
> data_direction == DMA_TO_DEVICE);
> if (unlikely(ret)) {
> vq_err(vq, "Failed to map iov to sgl\n");
> - break; /* TODO */
> + goto err;
> }
> }
>
Mmmm, I think these cases also require a VIRTIO_SCSI_S_BAD_TARGET +
__copy_to_user + vhost_add_used_and_signal similar to how !tv_tpg is
handled.. Otherwise virtio-scsi will end up in scsi timeout -> abort,
no..?
Ditto for the vhost_scsi_allocate_cmd failure case..
vhost-net uses vhost_discard_vq_desc for some failure cases, is that
needed here for the failure cases before __copy_from_user is called..?
> @@ -916,6 +916,11 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
> }
>
> mutex_unlock(&vq->mutex);
> + return;
> +
> +err:
> + vhost_scsi_free_cmd(tv_cmd);
> + mutex_unlock(&vq->mutex);
> }
>
> static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
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