[libvirt] [PATCH v2 3/4] secret: Properly handle @def after virSecretObjAdd in driver

[Pavel Hrdina]

On Fri, Jul 14, 2017 at 10:04:41AM -0400, John Ferlan wrote:
> Since the virSecretObjListAdd technically consumes @def on success,
> the secretDefineXML should set @def = NULL immediately and process
> the remaining calls using a new @objdef variable. We can use use
> VIR_STEAL_PTR since we know the Add function just stores @def in
> obj->def.
> 
> This fixes a possible double free of @def if the code jumps to
> restore_backup: and calls virSecretObjListRemove without setting
> def = NULL. In this case, the subsequent call to DefFree would
> succeed and free @def; however, the call to EndAPI would also
> call DefFree because the Unref done would be the last one for
> the @obj meaning the obj->def would be used to call DefFree,
> but it's already been free'd because @def wasn't managed right
> within this error path.
> 
> Signed-off-by: John Ferlan <jferlan at redhat.com>
> ---
>  src/secret/secret_driver.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/src/secret/secret_driver.c b/src/secret/secret_driver.c
> index 30124b4..77351d8 100644
> --- a/src/secret/secret_driver.c
> +++ b/src/secret/secret_driver.c
> @@ -210,6 +210,7 @@ secretDefineXML(virConnectPtr conn,
>  {
>      virSecretPtr ret = NULL;
>      virSecretObjPtr obj = NULL;
> +    virSecretDefPtr objdef;

s/objdef/objDef/

Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
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