[libvirt] [PATCH 1/2] conf: Fix crash in virDomainDefCompatibleDevice

[Jiri Denemark]

On Thu, Mar 01, 2018 at 08:03:38 -0500, John Ferlan wrote:
> Commit id 'edae027c' blindly assumed that the passed @oldDev
> parameter would not be NULL when calling virDomainDeviceGetInfo;
> however, commit id 'b6a264e8' passed NULL for AttachDevice
> callers under the premise that there wouldn't be a device
> to check/update against.
> 
> Signed-off-by: John Ferlan <jferlan at redhat.com>
> ---
>  src/conf/domain_conf.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index d96b012b9..fcafc8b2f 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -27417,9 +27417,12 @@ virDomainDefCompatibleDevice(virDomainDefPtr def,
>  {
>      virDomainCompatibleDeviceData data = {
>          .newInfo = virDomainDeviceGetInfo(dev),
> -        .oldInfo = virDomainDeviceGetInfo(oldDev),
> +        .oldInfo = NULL,
>      };
>  
> +    if (oldDev)
> +        data.oldInfo = virDomainDeviceGetInfo(oldDev);
> +
>      if (!virDomainDefHasUSB(def) &&
>          def->os.type != VIR_DOMAIN_OSTYPE_EXE &&
>          virDomainDeviceIsUSB(dev)) {

Oops, it was supposed to be like this as oldDev is explicitly optional.
Not sure where I lost this...

ACK, thanks.

Jirka