ASoC: SOF: IPC3: fix message bounds on ipc ops

commit 74ad8ed ("ASoC: SOF: ipc3: Implement rx_msg IPC ops")
introduced a new allocation before the upper bounds check in
do_rx_work. As a result A DSP can cause bad allocations if spewing
garbage.

Fixes: 74ad8ed ("ASoC: SOF: ipc3: Implement rx_msg IPC ops")
Reported-by: Tim Van Patten <[email protected]>
Cc: [email protected]
Signed-off-by: Curtis Malainey <[email protected]>
Reviewed-by: Péter Ujfalusi <[email protected]>
Reviewed-by: Daniel Baluta <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Signed-off-by: Peter Ujfalusi <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: cujomalainey

sound/soc/sof/ipc3.c

@@ -1067,7 +1067,7 @@ static void sof_ipc3_rx_msg(struct snd_sof_dev *sdev)
 		return;
 	}
 
-	if (hdr.size < sizeof(hdr)) {
+	if (hdr.size < sizeof(hdr) || hdr.size > SOF_IPC_MSG_MAX_SIZE) {
 		dev_err(sdev->dev, "The received message size is invalid\n");
 		return;
 	}