[PATCH v4 01/10] topology: decode: Fix channel map memory allocation

[Piotr Maziarz]

Memory allocated on the stack was referenced outside of the function scope
caused undefined behaviour.

Signed-off-by: Piotr Maziarz <piotrx.maziarz at linux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski at intel.com>
Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski at linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 src/topology/ctl.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/topology/ctl.c b/src/topology/ctl.c
index 90241b6..6e6c1d1 100644
--- a/src/topology/ctl.c
+++ b/src/topology/ctl.c
@@ -1330,7 +1330,6 @@ int tplg_decode_control_enum1(snd_tplg_t *tplg,
 			      void *bin, size_t size)
 {
 	struct snd_soc_tplg_enum_control *ec = bin;
-	struct snd_tplg_channel_map_template cmt;
 	int i;
 
 	if (size < sizeof(*ec)) {
@@ -1375,11 +1374,13 @@ int tplg_decode_control_enum1(snd_tplg_t *tplg,
 		}
 	}
 
-	et->map = &cmt;
-	memset(&cmt, 0, sizeof(cmt));
-	cmt.num_channels = ec->num_channels;
-	for (i = 0; i < cmt.num_channels; i++) {
-		struct snd_tplg_channel_elem *channel = &cmt.channel[i];
+	et->map = tplg_calloc(heap, sizeof(struct snd_tplg_channel_map_template));
+	if (!et->map)
+		return -ENOMEM;
+	et->map->num_channels = ec->num_channels;
+	for (i = 0; i < et->map->num_channels; i++) {
+		struct snd_tplg_channel_elem *channel = &et->map->channel[i];
+
 		tplg_log(tplg, 'D', pos + ((void *)&ec->channel[i] - (void *)ec),
 			 "enum: channel size %d", ec->channel[i].size);
 		channel->reg = ec->channel[i].reg;
-- 
2.7.4