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ASoC: hdac_hdmi: Fix possible NULL pointer dereference 

Pointers hdac_hdmi_pcm and hda_device_id can be NULL, so add check for
valid pointer to avoid NULL pointer dereference.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Subhransu S. Prusty 2017-11-07 16:16:25 +05:30 committed by Mark Brown
parent 70e97a2d9c
commit eb50fa1739
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
sound/soc/codecs/hdac_hdmi.c
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@ -1895,6 +1895,9 @@ static void hdac_hdmi_set_chmap(struct hdac_device *hdac, int pcm_idx,
struct hdac_hdmi_pcm *pcm = get_hdmi_pcm_from_id(hdmi, pcm_idx);
struct hdac_hdmi_port *port;
if (!pcm)
return;
if (list_empty(&pcm->port_list))
return;
@ -1913,6 +1916,9 @@ static bool is_hdac_hdmi_pcm_attached(struct hdac_device *hdac, int pcm_idx)
struct hdac_hdmi_priv *hdmi = edev->private_data;
struct hdac_hdmi_pcm *pcm = get_hdmi_pcm_from_id(hdmi, pcm_idx);
if (!pcm)
return false;
if (list_empty(&pcm->port_list))
return false;
@ -1926,6 +1932,9 @@ static int hdac_hdmi_get_spk_alloc(struct hdac_device *hdac, int pcm_idx)
struct hdac_hdmi_pcm *pcm = get_hdmi_pcm_from_id(hdmi, pcm_idx);
struct hdac_hdmi_port *port;
if (!pcm)
return 0;
if (list_empty(&pcm->port_list))
return 0;
@ -1979,6 +1988,9 @@ static int hdac_hdmi_dev_probe(struct hdac_ext_device *edev)
hdmi_priv->chmap.ops.is_pcm_attached = is_hdac_hdmi_pcm_attached;
hdmi_priv->chmap.ops.get_spk_alloc = hdac_hdmi_get_spk_alloc;
if (!hdac_id)
return -ENODEV;
if (hdac_id->driver_data)
hdmi_priv->drv_data =
(struct hdac_hdmi_drv_data *)hdac_id->driver_data;