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.

---
 sound/soc/sof/ipc4-mtrace.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

index 70dea8ae706e..0ec6ef681012 100644
@@ -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

Applied to

broonie/sound.git for-next

Thanks!

[1/1] ASoC: SOF: ipc4-mtrace: prevent underflow in sof_ipc4_priority_mask_dfs_write()

      commit: ea57680af47587397f5005d7758022441ed66d54

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

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Thanks,
Mark