[PATCH 6.6 104/175] ASoC: SOF: ipc4-topology: Allow bytes controls without initial payload

Greg Kroah-Hartman
2026-03-31T16:28:10Z

From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

commit d40a198e2b7821197c5c77b89d0130cc90f400f5 upstream.

It is unexpected, but allowed to have no initial payload for a bytes
control and the code is prepared to handle this case, but the size check
missed this corner case.

Update the check for minimal size to allow the initial size to be 0.

Cc: stable@vger.kernel.org
Fixes: a653820700b8 ("ASoC: SOF: ipc4-topology: Correct the allocation size for bytes controls")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://patch.msgid.link/20260326075618.1603-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/sof/ipc4-topology.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -2203,7 +2203,7 @@ static int sof_ipc4_control_load_bytes(s
return -EINVAL;
}

- if (scontrol->priv_size < sizeof(struct sof_abi_hdr)) {
+ if (scontrol->priv_size && scontrol->priv_size < sizeof(struct sof_abi_hdr)) {
dev_err(sdev->dev,
"bytes control %s initial data size %zu is insufficient.\n",
scontrol->name, scontrol->priv_size);