[PATCH] ASoC: SOF: ipc4-mtrace: prevent underflow in sof_ipc4_priority_mask_dfs_write()

[Dan Carpenter]

The "id" comes from the user.  Change the type to unsigned to prevent
an array underflow.

Fixes: f4ea22f7aa75 ("ASoC: SOF: ipc4: Add support for mtrace log extraction")
Signed-off-by: Dan Carpenter <error27 at gmail.com>
---
 sound/soc/sof/ipc4-mtrace.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/soc/sof/ipc4-mtrace.c b/sound/soc/sof/ipc4-mtrace.c
index 70dea8ae706e..0ec6ef681012 100644
--- a/sound/soc/sof/ipc4-mtrace.c
+++ b/sound/soc/sof/ipc4-mtrace.c
@@ -344,9 +344,10 @@ static ssize_t sof_ipc4_priority_mask_dfs_write(struct file *file,
 						size_t count, loff_t *ppos)
 {
 	struct sof_mtrace_priv *priv = file->private_data;
-	int id, ret;
+	unsigned int id;
 	char *buf;
 	u32 mask;
+	int ret;
 
 	/*
 	 * To update Nth mask entry, write:
@@ -357,9 +358,9 @@ static ssize_t sof_ipc4_priority_mask_dfs_write(struct file *file,
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
-	ret = sscanf(buf, "%d,0x%x", &id, &mask);
+	ret = sscanf(buf, "%u,0x%x", &id, &mask);
 	if (ret != 2) {
-		ret = sscanf(buf, "%d,%x", &id, &mask);
+		ret = sscanf(buf, "%u,%x", &id, &mask);
 		if (ret != 2) {
 			ret = -EINVAL;
 			goto out;
-- 
2.35.1