[libvirt] [PATCH 3/7] tests: qemuhotplug: Fix segfault when XML loading fails

[Michal Privoznik]

On 07/24/2018 11:23 PM, Cole Robinson wrote:
> Some tests use the same VM state multiple times in a row. But if we
> failed loading the VM XML, subsequent tests crash on the NULL def
> pointer
> 
> Signed-off-by: Cole Robinson <crobinso at redhat.com>
> ---
> I hit this with failing tests while writing this series
> 
>  tests/qemuhotplugtest.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tests/qemuhotplugtest.c b/tests/qemuhotplugtest.c
> index 674ba92b27..4f9e127f88 100644
> --- a/tests/qemuhotplugtest.c
> +++ b/tests/qemuhotplugtest.c
> @@ -268,6 +268,8 @@ testQemuHotplug(const void *data)
>  
>      if (test->vm) {
>          vm = test->vm;
> +        if (!vm->def)
> +            goto cleanup;
>      } else {
>          if (qemuHotplugCreateObjects(driver.xmlopt, &vm, domain_xml,
>                                       test->deviceDeletedEvent) < 0)
> 

I wonder if we should fprintf(stderr, "test skipped because of an
failure in dependant test"); or something among these lines. The idea
being it's easier to debug. Look at all places where we 'goto cleanup'.
At least libvirt error is reported there (virAsprintf reports OOM,
virTestLoadFile reports error too, etc.).

Michal