[PATCH] ASoC: SOF: topology: Prevent NULL pointer dereference with no TLV

[Kai Vehmanen]

From: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>

When there is no TLV data in topology, extracting the TLV data
could result in a NULL pointer exception. Prevent this by making
sure that the TLV data exists before extracting it.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
Reviewed-by: Paul Olaru <paul.olaru at oss.nxp.com>
Reviewed-by: Bard Liao <bard.liao at intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
---
 sound/soc/sof/topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index b69f493b5faa..46089000524d 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -1073,7 +1073,7 @@ static int sof_control_load_volume(struct snd_soc_component *scomp,
 	scontrol->cmd = SOF_CTRL_CMD_VOLUME;
 
 	/* extract tlv data */
-	if (get_tlv_data(kc->tlv.p, tlv) < 0) {
+	if (!kc->tlv.p || get_tlv_data(kc->tlv.p, tlv) < 0) {
 		dev_err(scomp->dev, "error: invalid TLV data\n");
 		ret = -EINVAL;
 		goto out_free;

base-commit: 8ac9e476b86851c94e0f33bea758e0a00e3f875e
-- 
2.29.2