[PATCH] ASoC: sdw_utils: Check speaker component string allocation

[Cássio Gabriel]

devm_kasprintf() can fail while building the temporary speaker
component string. If that happens, spk_components is set to NULL, but
the current code can still pass it to strlen() on a later loop iteration
or after the loop when appending the speaker component list to
card->components.

Use NULL to represent the initial "no speaker components" state, and
return -ENOMEM immediately if building spk_components fails.

Fixes: 0f60ecffbfe3 ("ASoC: sdw_utils: generate combined spk components string")
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@xxxxxxxxx>
---
 sound/soc/sdw_utils/soc_sdw_utils.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sdw_utils/soc_sdw_utils.c b/sound/soc/sdw_utils/soc_sdw_utils.c
index d8378d1b435e..5f4cfb2aa9d4 100644
--- a/sound/soc/sdw_utils/soc_sdw_utils.c
+++ b/sound/soc/sdw_utils/soc_sdw_utils.c
@@ -1265,7 +1265,7 @@ int asoc_sdw_rtd_init(struct snd_soc_pcm_runtime *rtd)
 	struct asoc_sdw_codec_info *codec_info;
 	struct snd_soc_dai *dai;
 	struct sdw_slave *sdw_peripheral;
-	const char *spk_components="";
+	const char *spk_components = NULL;
 	int dai_index;
 	int ret;
 	int i;
@@ -1348,7 +1348,7 @@ int asoc_sdw_rtd_init(struct snd_soc_pcm_runtime *rtd)
 			else
 				component = codec_info->dais[dai_index].component_name;
 
-			if (strlen (spk_components) == 0)
+			if (!spk_components)
 				spk_components =
 					devm_kasprintf(card->dev, GFP_KERNEL, "%s", component);
 			else
@@ -1356,13 +1356,15 @@ int asoc_sdw_rtd_init(struct snd_soc_pcm_runtime *rtd)
 				spk_components =
 					devm_kasprintf(card->dev, GFP_KERNEL,
 						       "%s+%s", spk_components, component);
+
+			if (!spk_components)
+				return -ENOMEM;
 		}
 
 		codec_info->dais[dai_index].rtd_init_done = true;
-
 	}
 
-	if (strlen (spk_components) > 0) {
+	if (spk_components) {
 		/* Update card components for speaker components */
 		card->components = devm_kasprintf(card->dev, GFP_KERNEL, "%s spk:%s",
 						  card->components, spk_components);

---
base-commit: b69796b4e3f78b1c41c0e6f558e882ec095469fc
change-id: 20260509-asoc-sdw-utils-spk-components-alloc-539e19f08a2c

Best regards,
--  
Cássio Gabriel <cassiogabrielcontato@xxxxxxxxx>