The header.numid is set to scontrol->comp_id in bytes_ext_get and it is ignored during bytes_ext_put. The use of comp_id is not quite great as it is kernel internal identification number.

Set the header.numid to SOF_CTRL_CMD_BINARY during get and validate the numid during put to provide consistent and compatible identification number as IPC3.

For IPC4 existing tooling also ignored the numid but with the use of SOF_CTRL_CMD_BINARY the different handling of the blobs can be dropped, providing better user experience.

Reported-by: Seppo Ingalsuo seppo.ingalsuo@linux.intel.com Closes: https://github.com/thesofproject/linux/issues/5282 Fixes: a062c8899fed ("ASoC: SOF: ipc4-control: Add support for bytes control get and put") Cc: stable@vger.kernel.org Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Seppo Ingalsuo seppo.ingalsuo@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Liam Girdwood liam.r.girdwood@intel.com --- sound/soc/sof/ipc4-control.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc4-control.c b/sound/soc/sof/ipc4-control.c index 576f407cd456..976a4794d610 100644 --- a/sound/soc/sof/ipc4-control.c +++ b/sound/soc/sof/ipc4-control.c @@ -531,6 +531,14 @@ static int sof_ipc4_bytes_ext_put(struct snd_sof_control *scontrol, return -EINVAL; }

+ /* Check header id */ + if (header.numid != SOF_CTRL_CMD_BINARY) { + dev_err_ratelimited(scomp->dev, + "Incorrect numid for bytes put %d\n", + header.numid); + return -EINVAL; + } + /* Verify the ABI header first */ if (copy_from_user(&abi_hdr, tlvd->tlv, sizeof(abi_hdr))) return -EFAULT; @@ -613,7 +621,8 @@ static int _sof_ipc4_bytes_ext_get(struct snd_sof_control *scontrol, if (data_size > size) return -ENOSPC;

- header.numid = scontrol->comp_id; + /* Set header id and length */ + header.numid = SOF_CTRL_CMD_BINARY; header.length = data_size;

if (copy_to_user(tlvd, &header, sizeof(struct snd_ctl_tlv)))