ASoC: hdac_hdmi: Fix potential NULL dereference

Static checker warns:
Pointer 'hlink' returned from call to function 'snd_hdac_ext_bus_get_link'
at line may be NULL and will be dereferenced"

So we should always check the return of snd_hdac_ext_bus_get_link() before
referencing the link pointer

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index 181cd3b..2abb742 100644 (file)
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -1474,6 +1474,11 @@ static int hdmi_codec_probe(struct snd_soc_codec *codec)
         * exit, we call pm_runtime_suspend() so that will do for us
         */
        hlink = snd_hdac_ext_bus_get_link(edev->ebus, dev_name(&edev->hdac.dev));
+       if (!hlink) {
+               dev_err(&edev->hdac.dev, "hdac link not found\n");
+               return -EIO;
+       }
+
        snd_hdac_ext_bus_link_get(edev->ebus, hlink);
 
        ret = create_fill_widget_route_map(dapm);
@@ -1634,6 +1639,11 @@ static int hdac_hdmi_dev_probe(struct hdac_ext_device *edev)
 
        /* hold the ref while we probe */
        hlink = snd_hdac_ext_bus_get_link(edev->ebus, dev_name(&edev->hdac.dev));
+       if (!hlink) {
+               dev_err(&edev->hdac.dev, "hdac link not found\n");
+               return -EIO;
+       }
+
        snd_hdac_ext_bus_link_get(edev->ebus, hlink);
 
        hdmi_priv = devm_kzalloc(&codec->dev, sizeof(*hdmi_priv), GFP_KERNEL);
@@ -1744,6 +1754,11 @@ static int hdac_hdmi_runtime_suspend(struct device *dev)
        }
 
        hlink = snd_hdac_ext_bus_get_link(ebus, dev_name(dev));
+       if (!hlink) {
+               dev_err(dev, "hdac link not found\n");
+               return -EIO;
+       }
+
        snd_hdac_ext_bus_link_put(ebus, hlink);
 
        return 0;
@@ -1765,6 +1780,11 @@ static int hdac_hdmi_runtime_resume(struct device *dev)
                return 0;
 
        hlink = snd_hdac_ext_bus_get_link(ebus, dev_name(dev));
+       if (!hlink) {
+               dev_err(dev, "hdac link not found\n");
+               return -EIO;
+       }
+
        snd_hdac_ext_bus_link_get(ebus, hlink);
 
        err = snd_hdac_display_power(bus, true);