linux-kernel - [PATCH AUTOSEL 6.2 14/45] ASoC: SOF: ipc3: Check for upper size limit for the received message

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Message-Id: <20230322195639.1995821-14-sashal@kernel.org>
Date:   Wed, 22 Mar 2023 15:56:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Curtis Malainey <cujomalainey@...omium.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Curtis Malainey <curtis@...ainey.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com,
        yung-chuan.liao@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        daniel.baluta@....com, perex@...ex.cz, tiwai@...e.com,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.2 14/45] ASoC: SOF: ipc3: Check for upper size limit for the received message

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

[ Upstream commit 989a3e4479177d0f4afab8be1960731bc0ffbbd0 ]

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@...omium.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Curtis Malainey <curtis@...ainey.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Link: https://lore.kernel.org/r/20230307114917.5124-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/sof/ipc3.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/ipc3.c b/sound/soc/sof/ipc3.c
index 1fef4dcc09368..fde8af5a1f485 100644
--- 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;
 	}
 
-- 
2.39.2