Re: [PATCH 09/12] virSecurityDeviceLabelDefParseXML: Use automatic memory clearing for temp strings

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On Mon, 2021-11-22 at 18:12 +0100, Peter Krempa wrote:
> Apart from code simplification the refactor of 'model' fixes an
> unlikely
> memory leak of the string if a duplicate model is found.
> 
> While the coversion of 'label' variable may seem unnecessary it will
> come in handy in the next patch.
> 
> Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
> ---
>  src/conf/domain_conf.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index bd9da0744d..e829511ac5 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -8016,7 +8016,10 @@
> virSecurityDeviceLabelDefParseXML(virSecurityDeviceLabelDef
> ***seclabels_rtn,
>      size_t nseclabels = 0;
>      int n;
>      size_t i, j;
> -    char *model, *relabel, *label, *labelskip;
> +    g_autofree char *model = NULL;
> +    g_autofree char *relabel = NULL;
> +    g_autofree char *label = NULL;
> +    g_autofree char *labelskip = NULL;
>      g_autofree xmlNodePtr *list = NULL;
> 
>      if ((n = virXPathNodeSet("./seclabel", ctxt, &list)) < 0)
> @@ -8041,7 +8044,7 @@
> virSecurityDeviceLabelDefParseXML(virSecurityDeviceLabelDef
> ***seclabels_rtn,
>                      goto error;
>                  }
>              }
> -            seclabels[i]->model = model;
> +            seclabels[i]->model = g_steal_pointer(&model);
>          }
> 
>          relabel = virXMLPropString(list[i], "relabel");
> @@ -8050,10 +8053,8 @@
> virSecurityDeviceLabelDefParseXML(virSecurityDeviceLabelDef
> ***seclabels_rtn,
>                  virReportError(VIR_ERR_XML_ERROR,
>                                 _("invalid security relabel value
> %s"),
>                                 relabel);
> -                VIR_FREE(relabel);
>                  goto error;
>              }
> -            VIR_FREE(relabel);
>          } else {
>              seclabels[i]->relabel = true;
>          }
> @@ -8063,14 +8064,13 @@
> virSecurityDeviceLabelDefParseXML(virSecurityDeviceLabelDef
> ***seclabels_rtn,
>          seclabels[i]->labelskip = false;
>          if (labelskip && !(flags & VIR_DOMAIN_DEF_PARSE_INACTIVE))
>              ignore_value(virStringParseYesNo(labelskip,
> &seclabels[i]->labelskip));
> -        VIR_FREE(labelskip);
> 
>          ctxt->node = list[i];
>          label = virXPathStringLimit("string(./label)",
>                                      VIR_SECURITY_LABEL_BUFLEN-1,
> ctxt);
> -        seclabels[i]->label = label;
> +        seclabels[i]->label = g_steal_pointer(&label);
> 
> -        if (label && !seclabels[i]->relabel) {
> +        if (seclabels[i]->label && !seclabels[i]->relabel) {
>              virReportError(VIR_ERR_XML_ERROR,
>                             _("Cannot specify a label if relabelling
> is "
>                               "turned off. model=%s"),

Theese look like they could be simplified to three calls to
`virXMLPropTristateBool`




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