'STREQ' is used to compare the override alias with the device alias. While the parser ensures that the override alias is non-NULL, the device alias may be NULL and STREQ doesn't handle that. Fixes: 38ab5c9ead5 Resolves: https://gitlab.com/libvirt/libvirt/-/issues/321 Signed-off-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- src/qemu/qemu_command.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 52e4ef03cd..b1be77743c 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -240,6 +240,10 @@ qemuBuildDeviceCommandlineHandleOverrides(virJSONValue *props, const char *alias = virJSONValueObjectGetString(props, "id"); size_t i; + /* If the device doesn't have an alias we can't override it's props */ + if (!alias) + return; + for (i = 0; i < nsdef->ndeviceOverride; i++) { qemuDomainXmlNsDeviceOverride *dev = nsdef->deviceOverride + i; size_t j; -- 2.36.1