[PATCH] ASoC: topology: Fix route memory corruption

[Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>]

It was reported that recent fix for memory corruption during topology
load, causes corruption in other cases. Instead of being overeager with
checking topology, assume that it is properly formatted and just
duplicate strings.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-sound/171812236450.201359.3019210915105428447.b4-ty@xxxxxxxxxx/T/#m8c4bd5abf453960fde6f826c4b7f84881da63e9d
Suggested-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
---
 sound/soc/soc-topology.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 0225bc5fc425a..4b166294602fa 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -1052,21 +1052,15 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg,
 			break;
 		}
 
-		route->source = devm_kmemdup(tplg->dev, elem->source,
-					     min(strlen(elem->source), maxlen),
-					     GFP_KERNEL);
-		route->sink = devm_kmemdup(tplg->dev, elem->sink,
-					   min(strlen(elem->sink), maxlen),
-					   GFP_KERNEL);
+		route->source = devm_kstrdup(tplg->dev, elem->source, GFP_KERNEL);
+		route->sink = devm_kstrdup(tplg->dev, elem->sink, GFP_KERNEL);
 		if (!route->source || !route->sink) {
 			ret = -ENOMEM;
 			break;
 		}
 
 		if (strnlen(elem->control, maxlen) != 0) {
-			route->control = devm_kmemdup(tplg->dev, elem->control,
-						      min(strlen(elem->control), maxlen),
-						      GFP_KERNEL);
+			route->control = devm_kstrdup(tplg->dev, elem->control, GFP_KERNEL);
 			if (!route->control) {
 				ret = -ENOMEM;
 				break;
-- 
2.34.1