Merge series "ASoC: SOF: fix kcontrol size checks" from Kai Vehmanen <kai.vehmanen@linux.intel.com>:

Series that fixes checks for 'size' in kcontrol get/put ext_bytes methods
for SOF. The gaps in these checks were discovered via cppcheck warnings
on unused variable values.

Pierre-Louis Bossart (5):
  ASoC: SOF: control: fix size checks for ext_bytes control .get()
  ASoC: SOF: control: fix size checks for volatile ext_bytes control
    .get()
  ASoC: SOF: control: add size checks for ext_bytes control .put()
  ASoC: SOF: control: remove const in sizeof()
  ASoC: SOF: topology: remove const in sizeof()

 sound/soc/sof/control.c  | 53 +++++++++++++++++++++++++++++++---------
 sound/soc/sof/topology.c |  2 +-
 2 files changed, 43 insertions(+), 12 deletions(-)

--
2.27.0

1 files changed, 32 insertions, 1 deletions

diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index 58f8c998e6af..0352d2b61358 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -300,6 +300,10 @@ int snd_sof_bytes_ext_put(struct snd_kcontrol *kcontrol,
 	const struct snd_ctl_tlv __user *tlvd =
 		(const struct snd_ctl_tlv __user *)binary_data;
 
+	/* make sure we have at least a header */
+	if (size < sizeof(struct snd_ctl_tlv))
+		return -EINVAL;
+
 	/*
 	 * The beginning of bytes data contains a header from where
 	 * the length (as bytes) is needed to know the correct copy
@@ -308,6 +312,13 @@ int snd_sof_bytes_ext_put(struct snd_kcontrol *kcontrol,
 	if (copy_from_user(&header, tlvd, sizeof(const struct snd_ctl_tlv)))
 		return -EFAULT;
 
+	/* make sure TLV info is consistent */
+	if (header.length + sizeof(struct snd_ctl_tlv) > size) {
+		dev_err_ratelimited(scomp->dev, "error: inconsistent TLV, data %d + header %zu > %d\n",
+				    header.length, sizeof(struct snd_ctl_tlv), size);
+		return -EINVAL;
+	}
+
 	/* be->max is coming from topology */
 	if (header.length > be->max) {
 		dev_err_ratelimited(scomp->dev, "error: Bytes data size %d exceeds max %d.\n",
@@ -369,6 +380,14 @@ int snd_sof_bytes_ext_volatile_get(struct snd_kcontrol *kcontrol, unsigned int _
 	int ret;
 	int err;
 
+	/*
+	 * Decrement the limit by ext bytes header size to
+	 * ensure the user space buffer is not exceeded.
+	 */
+	if (size < sizeof(struct snd_ctl_tlv))
+		return -ENOSPC;
+	size -= sizeof(struct snd_ctl_tlv);
+
 	ret = pm_runtime_get_sync(scomp->dev);
 	if (ret < 0 && ret != -EACCES) {
 		dev_err_ratelimited(scomp->dev, "error: bytes_ext get failed to resume %d\n", ret);
@@ -396,6 +415,12 @@ int snd_sof_bytes_ext_volatile_get(struct snd_kcontrol *kcontrol, unsigned int _
 
 	data_size = cdata->data->size + sizeof(const struct sof_abi_hdr);
 
+	/* make sure we don't exceed size provided by user space for data */
+	if (data_size > size) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
 	header.numid = scontrol->cmd;
 	header.length = data_size;
 	if (copy_to_user(tlvd, &header, sizeof(const struct snd_ctl_tlv))) {
@@ -432,7 +457,9 @@ int snd_sof_bytes_ext_get(struct snd_kcontrol *kcontrol,
 	 * Decrement the limit by ext bytes header size to
 	 * ensure the user space buffer is not exceeded.
 	 */
-	size -= sizeof(const struct snd_ctl_tlv);
+	if (size < sizeof(struct snd_ctl_tlv))
+		return -ENOSPC;
+	size -= sizeof(struct snd_ctl_tlv);
 
 	/* set the ABI header values */
 	cdata->data->magic = SOF_ABI_MAGIC;
@@ -448,6 +475,10 @@ int snd_sof_bytes_ext_get(struct snd_kcontrol *kcontrol,
 
 	data_size = cdata->data->size + sizeof(const struct sof_abi_hdr);
 
+	/* make sure we don't exceed size provided by user space for data */
+	if (data_size > size)
+		return -ENOSPC;
+
 	header.numid = scontrol->cmd;
 	header.length = data_size;
 	if (copy_to_user(tlvd, &header, sizeof(const struct snd_ctl_tlv)))