Re: [Qemu-devel] [Qemu-block] [PATCH 12/15] gluster: Plug memory leaks in qemu_gluster_parse_json()

[Niels de Vos <ndevos@redhat.com>]

On Thu, Mar 02, 2017 at 10:44:03PM +0100, Markus Armbruster wrote:
> To reproduce, run
> 
>     $ valgrind qemu-system-x86_64 --nodefaults -S --drive driver=gluster,volume=testvol,path=/a/b/c,server.0.type=xxx
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  block/gluster.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/block/gluster.c b/block/gluster.c
> index 6fbcf9e..35a7abb 100644
> --- a/block/gluster.c
> +++ b/block/gluster.c
> @@ -480,7 +480,7 @@ static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
>                                    QDict *options, Error **errp)
>  {
>      QemuOpts *opts;
> -    GlusterServer *gsconf;
> +    GlusterServer *gsconf = NULL;
>      GlusterServerList *curr = NULL;
>      QDict *backing_options = NULL;
>      Error *local_err = NULL;
> @@ -529,17 +529,16 @@ static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
>          }
>  
>          ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
> +        if (!ptr) {
> +            error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
> +            error_append_hint(&local_err, GERR_INDEX_HINT, i);
> +            goto out;
> +
> +        }
>          gsconf = g_new0(GlusterServer, 1);
>          gsconf->type = qapi_enum_parse(GlusterTransport_lookup, ptr,
> -                                       GLUSTER_TRANSPORT__MAX,
> -                                       GLUSTER_TRANSPORT__MAX,
> +                                       GLUSTER_TRANSPORT__MAX, 0,

What is the reason to set the default to 0 and not the more readable
GLUSTER_TRANSPORT_UNIX?

>                                         &local_err);
> -        if (!ptr) {
> -            error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
> -            error_append_hint(&local_err, GERR_INDEX_HINT, i);
> -            goto out;
> -
> -        }
>          if (local_err) {
>              error_append_hint(&local_err,
>                                "Parameter '%s' may be 'tcp' or 'unix'\n",
> @@ -626,8 +625,10 @@ static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
>              curr->next->value = gsconf;
>              curr = curr->next;
>          }
> +        gsconf = NULL;
>  
> -        qdict_del(backing_options, str);
> +        QDECREF(backing_options);
> +        backing_options = NULL;
>          g_free(str);
>          str = NULL;
>      }
> @@ -636,11 +637,10 @@ static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
>  
>  out:
>      error_propagate(errp, local_err);
> +    qapi_free_GlusterServer(gsconf);
>      qemu_opts_del(opts);
> -    if (str) {
> -        qdict_del(backing_options, str);
> -        g_free(str);
> -    }
> +    g_free(str);
> +    QDECREF(backing_options);
>      errno = EINVAL;
>      return -errno;
>  }
> -- 
> 2.7.4
> 
>