qemu_blockjob: Avoid dereferencing NULL on OOM

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
index 4ada4cd277d420e0f84095e3ce4360336b3ffc6c..985fae1e96ebf2aee5da7927cfda1431fa86af4c 100644 (file)
--- a/src/qemu/qemu_blockjob.c
+++ b/src/qemu/qemu_blockjob.c
@@ -123,7 +123,8 @@ qemuBlockJobEventProcess(virQEMUDriverPtr driver,
                 if ((persistDisk = virDomainDiskByName(vm->newDef,
                                                        disk->dst, false))) {
                     copy = virStorageSourceCopy(disk->mirror, false);
-                    if (virStorageSourceInitChainElement(copy,
+                    if (!copy ||
+                        virStorageSourceInitChainElement(copy,
                                                          persistDisk->src,
                                                          true) < 0) {
                         VIR_WARN("Unable to update persistent definition "