[PATCH] staging: greybus: audio_codec: fix stack overflow in stream name parsing

[Yudi Yang <2000jedi@gmail.com>]

intf_name and dir are 32-byte buffers. Parsing a module-provided AIF
stream name with unbounded %s conversions can cause buffer-overwrites.
Limit each conversion to 31 characters.

Fixes: 60e7327d54b2 ("greybus: audio: Find data connection based on id")
Cc: stable@vger.kernel.org
Signed-off-by: Yudi Yang <2000jedi@gmail.com>
---
 drivers/staging/greybus/audio_codec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index 6daa4e706792..c3fefe1414f9 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -311,7 +311,7 @@ int gbaudio_module_update(struct gbaudio_codec_info *codec,
 	}
 
 	/* parse dai_id from AIF widget's stream_name */
-	if (sscanf(w->sname, "%s %d %s", intf_name, &dai_id, dir) != 3) {
+	if (sscanf(w->sname, "%31s %d %31s", intf_name, &dai_id, dir) != 3) {
 		dev_err(codec->dev, "Error while parsing dai_id for %s\n", w->name);
 		return -EINVAL;
 	}
-- 
2.43.0