[PATCH] qemu: fix memory leak on some paths

[Jiri Denemark]

On Thu, Sep 22, 2022 at 21:00:38 +0800, luzhipeng wrote:
> From: lu zhipeng <luzhipeng at cestc.cn>
> 
> virTypedParamsAddString may return -1 but alloc params,
> so free it.
> 
> Signed-off-by: lu zhipeng <luzhipeng at cestc.cn>
> ---
>  src/qemu/qemu_driver.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 94b70872d4..c4501cd705 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -4473,11 +4473,13 @@ qemuDomainPinVcpuLive(virDomainObj *vm,
>          goto cleanup;
>  
>      event = virDomainEventTunableNewFromObj(vm, eventParams, eventNparams);

This call consumes eventParams which should not be used afterwards. Thus
instead of

> -
> +    eventNparams = 0;

we should set eventParams = NULL here...

>      ret = 0;
>  
>   cleanup:
>      virObjectEventStateQueue(driver->domainEventState, event);

... and call virTypedParamsFree unconditionally.

> +    if (eventNparams)
> +        virTypedParamsFree(eventParams, eventNparams);
>      return ret;
>  }
>  

Alternatively, virDomainEventTunableNew could be changed to get
virTypedParameterPtr *params and set &params = NULL itself.

Jirka