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

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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@xxxxxxxxxx>
---
 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)) {
-- 
2.13.6

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