Ensure that the FD we're passing to QEMU is actually open, so we get a sane error message upfront instead of telling QEMU to use a closed FD. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/qemu/qemu_command.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 77470a6037..8c979fdf65 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -4704,6 +4704,12 @@ qemuBuildVhostUserChardevStr(const char *alias, { char *chardev = NULL; + if (*fd == -1) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Attempt to pass closed vhostuser FD")); + return NULL; + } + if (virAsprintf(&chardev, "socket,id=chr-vu-%s,fd=%d", alias, *fd) < 0) return NULL; -- 2.21.0