ASoC: SOF: ipc3: Check for upper size limit for the received message

The sof_ipc3_rx_msg() checks for minimum size of a new rx message but it is
missing the check for upper limit.
Corrupted or compromised firmware might be able to take advantage of this
to cause out of bounds reads outside of the message area.

Reported-by: Curtis Malainey <cujomalainey@chromium.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Curtis Malainey <curtis@malainey.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230307114917.5124-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/ipc3.c b/sound/soc/sof/ipc3.c
index 3de64ea..4493bbd 100644 (file)
--- a/sound/soc/sof/ipc3.c
+++ b/sound/soc/sof/ipc3.c
@@ -970,8 +970,9 @@ static void sof_ipc3_rx_msg(struct snd_sof_dev *sdev)
                return;
        }
 
-       if (hdr.size < sizeof(hdr)) {
-               dev_err(sdev->dev, "The received message size is invalid\n");
+       if (hdr.size < sizeof(hdr) || hdr.size > SOF_IPC_MSG_MAX_SIZE) {
+               dev_err(sdev->dev, "The received message size is invalid: %u\n",
+                       hdr.size);
                return;
        }