[PATCH] virsh: Check whether enough arguments was passed to iothreadset

[Claudio Fontana]

Reviewed-by: Claudio Fontana <cfontana at suse.de>

On 6/8/22 15:25, Michal Privoznik wrote:
> Virsh has iothreadset command which allows setting various
> attributes of IOThreads. However, when the command is called
> without any arguments (besides domain and IOThread IDs), then
> @params stays NULL and is passed to virDomainSetIOThreadParams()
> which produces rather user unfriendly error message:
> 
>   error: params in virDomainSetIOThreadParams must not be NULL
> 
> Introduce a check and produce better error message.
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
> ---
>  tools/virsh-domain.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
> index 5c4a7d7b8d..cfdaac1942 100644
> --- a/tools/virsh-domain.c
> +++ b/tools/virsh-domain.c
> @@ -7853,6 +7853,11 @@ cmdIOThreadSet(vshControl *ctl, const vshCmd *cmd)
>  
>  #undef VSH_IOTHREAD_SET_UINT_PARAMS
>  
> +    if (nparams == 0) {
> +        vshError(ctl, _("Not enough arguments passed, nothing to set"));
> +        goto cleanup;
> +    }
> +
>      if (virDomainSetIOThreadParams(dom, id, params, nparams, flags) < 0)
>          goto cleanup;
>