[PATCH AUTOSEL 5.19 13/48] ASoC: SOF: Intel: hda-ipc: Do not process IPC reply before firmware boot

From: Sasha Levin
Date: Sun Aug 14 2022 - 12:23:08 EST


From: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>

[ Upstream commit 499cc881b09c8283ab5e75b0d6d21cb427722161 ]

It is not yet clear, but it is possible to create a firmware so broken
that it will send a reply message before a FW_READY message (it is not
yet clear if FW_READY will arrive later).
Since the reply_data is allocated only after the FW_READY message, this
will lead to a NULL pointer dereference if not filtered out.

The issue was reported with IPC4 firmware but the same condition is present
for IPC3.

Reported-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220712122357.31282-3-peter.ujfalusi@xxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/soc/sof/intel/hda-ipc.c | 39 ++++++++++++++++++++++-------------
1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/sound/soc/sof/intel/hda-ipc.c b/sound/soc/sof/intel/hda-ipc.c
index f08011249955..65e688f749ea 100644
--- a/sound/soc/sof/intel/hda-ipc.c
+++ b/sound/soc/sof/intel/hda-ipc.c
@@ -148,17 +148,23 @@ irqreturn_t hda_dsp_ipc4_irq_thread(int irq, void *context)

if (primary & SOF_IPC4_MSG_DIR_MASK) {
/* Reply received */
- struct sof_ipc4_msg *data = sdev->ipc->msg.reply_data;
+ if (likely(sdev->fw_state == SOF_FW_BOOT_COMPLETE)) {
+ struct sof_ipc4_msg *data = sdev->ipc->msg.reply_data;

- data->primary = primary;
- data->extension = extension;
+ data->primary = primary;
+ data->extension = extension;

- spin_lock_irq(&sdev->ipc_lock);
+ spin_lock_irq(&sdev->ipc_lock);

- snd_sof_ipc_get_reply(sdev);
- snd_sof_ipc_reply(sdev, data->primary);
+ snd_sof_ipc_get_reply(sdev);
+ snd_sof_ipc_reply(sdev, data->primary);

- spin_unlock_irq(&sdev->ipc_lock);
+ spin_unlock_irq(&sdev->ipc_lock);
+ } else {
+ dev_dbg_ratelimited(sdev->dev,
+ "IPC reply before FW_READY: %#x|%#x\n",
+ primary, extension);
+ }
} else {
/* Notification received */

@@ -225,16 +231,21 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
* place, the message might not yet be marked as expecting a
* reply.
*/
- spin_lock_irq(&sdev->ipc_lock);
+ if (likely(sdev->fw_state == SOF_FW_BOOT_COMPLETE)) {
+ spin_lock_irq(&sdev->ipc_lock);

- /* handle immediate reply from DSP core */
- hda_dsp_ipc_get_reply(sdev);
- snd_sof_ipc_reply(sdev, msg);
+ /* handle immediate reply from DSP core */
+ hda_dsp_ipc_get_reply(sdev);
+ snd_sof_ipc_reply(sdev, msg);

- /* set the done bit */
- hda_dsp_ipc_dsp_done(sdev);
+ /* set the done bit */
+ hda_dsp_ipc_dsp_done(sdev);

- spin_unlock_irq(&sdev->ipc_lock);
+ spin_unlock_irq(&sdev->ipc_lock);
+ } else {
+ dev_dbg_ratelimited(sdev->dev, "IPC reply before FW_READY: %#x\n",
+ msg);
+ }

ipc_irq = true;
}
--
2.35.1