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

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@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/Y8laruWOEwOC/dx9@kili
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/ipc4-mtrace.c b/sound/soc/sof/ipc4-mtrace.c
index 70dea8a..0ec6ef6 100644 (file)
--- 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;