ASoC: SOF: Avoid double decrementing use_count in sof_widget_setup on error

The sof_widget_free() on the error path will decrement the use count and if
we jump to widget_free: then the use_count will be decremented by two,
which is not correct as we only incremented once with 1.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20230127120031.10709-17-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/sof-audio.c b/sound/soc/sof/sof-audio.c
index e626a1e..1e785e7 100644 (file)
--- a/sound/soc/sof/sof-audio.c
+++ b/sound/soc/sof/sof-audio.c
@@ -89,6 +89,7 @@ EXPORT_SYMBOL(sof_widget_free);
 int sof_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 {
        const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
+       bool use_count_decremented = false;
        int ret;
 
        /* skip if there is no private data */
@@ -160,13 +161,16 @@ int sof_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 widget_free:
        /* widget use_count and core ref_count will both be decremented by sof_widget_free() */
        sof_widget_free(sdev, swidget);
+       use_count_decremented = true;
 core_put:
        snd_sof_dsp_core_put(sdev, swidget->core);
 pipe_widget_free:
        if (swidget->id != snd_soc_dapm_scheduler)
                sof_widget_free(sdev, swidget->spipe->pipe_widget);
 use_count_dec:
-       swidget->use_count--;
+       if (!use_count_decremented)
+               swidget->use_count--;
+
        return ret;
 }
 EXPORT_SYMBOL(sof_widget_setup);