[PATCH] ASoC: SOF: ensure all fields in header are zero'd before copying back to userspace

[Colin King <colin.king@canonical.com>]

From: Colin Ian King <colin.king@canonical.com>

Field header.tlv is uninitialized and being copied back to userspace
and hence leaking data from the stack to userspace.  Fix this by
ensuring the header structure is zero'd.

Fixes: c3078f539704 ("ASoC: SOF: Add Sound Open Firmware KControl support")
Addresses-Coverity: ("Uninitialized scalar variable")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 sound/soc/sof/control.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index dfc412e2d956..97d5c1a4c1ff 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -362,7 +362,7 @@ int snd_sof_bytes_ext_get(struct snd_kcontrol *kcontrol,
 	struct snd_sof_control *scontrol = be->dobj.private;
 	struct snd_soc_component *scomp = scontrol->scomp;
 	struct sof_ipc_ctrl_data *cdata = scontrol->control_data;
-	struct snd_ctl_tlv header;
+	struct snd_ctl_tlv header = { };
 	struct snd_ctl_tlv __user *tlvd =
 		(struct snd_ctl_tlv __user *)binary_data;
 	int data_size;
-- 
2.25.1