[PATCH AUTOSEL 5.19 12/48] ASoC: SOF: Intel: cnl: Do not process IPC reply before firmware boot
From: Sasha Levin
Date: Sun Aug 14 2022 - 12:23:04 EST
From: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
[ Upstream commit acacd9eefd0def5a83244d88e5483b5f38ee7287 ]
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/20220712122357.31282-2-peter.ujfalusi@xxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/soc/sof/intel/cnl.c | 37 ++++++++++++++++++++++++-------------
1 file changed, 24 insertions(+), 13 deletions(-)
diff --git a/sound/soc/sof/intel/cnl.c b/sound/soc/sof/intel/cnl.c
index cd6e5f8a5eb4..6c98f65635fc 100644
--- a/sound/soc/sof/intel/cnl.c
+++ b/sound/soc/sof/intel/cnl.c
@@ -60,17 +60,23 @@ irqreturn_t cnl_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 */
notification_data.primary = primary;
@@ -124,15 +130,20 @@ irqreturn_t cnl_ipc_irq_thread(int irq, void *context)
CNL_DSP_REG_HIPCCTL,
CNL_DSP_REG_HIPCCTL_DONE, 0);
- 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);
- cnl_ipc_dsp_done(sdev);
+ cnl_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