ASoC: SOF: avoid a NULL dereference with unsupported widgets

If an IPC4 topology contains an unsupported widget, its .module_info
field won't be set, then sof_ipc4_route_setup() will cause a kernel
Oops trying to dereference it. Add a check for such cases.

Cc: stable@vger.kernel.org # 6.2
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230329113828.28562-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index a623707..669b99a 100644 (file)
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -1805,6 +1805,14 @@ static int sof_ipc4_route_setup(struct snd_sof_dev *sdev, struct snd_sof_route *
        u32 header, extension;
        int ret;
 
+       if (!src_fw_module || !sink_fw_module) {
+               /* The NULL module will print as "(efault)" */
+               dev_err(sdev->dev, "source %s or sink %s widget weren't set up properly\n",
+                       src_fw_module->man4_module_entry.name,
+                       sink_fw_module->man4_module_entry.name);
+               return -ENODEV;
+       }
+
        sroute->src_queue_id = sof_ipc4_get_queue_id(src_widget, sink_widget,
                                                     SOF_PIN_TYPE_SOURCE);
        if (sroute->src_queue_id < 0) {