util: set OOM in virCopyLastError if error is not set

virCopyLastError is intended to be used after last error is set.
However due to virLastErrorObject failures (very unlikely though
as thread local error is allocated on first use) we can have zero
fields in a copy as a result. In particular code field can be set
to VIR_ERR_OK.

In some places (qemu monitor, qemu agent and qemu migaration code
for example) we use copy result as a flag and this leads to bugs.

Let's set OOM-like error in copy in case of virLastErrorObject failures.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>

src/util/virerror.c

@@ -366,19 +366,26 @@ virSetError(virErrorPtr newerr)
  *
  * One will need to free the result with virResetError()
  *
- * Returns 0 if no error was found and the error code otherwise and -1 in case
- *         of parameter error.
+ * Returns error code or -1 in case of parameter error.
  */
 int
 virCopyLastError(virErrorPtr to)
 {
     virErrorPtr err = virLastErrorObject();
+
+    if (!to)
+        return -1;
+
     /* We can't guarantee caller has initialized it to zero */
     memset(to, 0, sizeof(*to));
-    if (err)
+    if (err) {
         virCopyError(err, to);
-    else
+    } else {
         virResetError(to);
+        to->code = VIR_ERR_NO_MEMORY;
+        to->domain = VIR_FROM_NONE;
+        to->level = VIR_ERR_ERROR;
+    }
     return to->code;
 }