linux-kernel - [PATCH 3.4 040/176] ASoC: sigmadsp: Refuse to load firmware files with a non-supported version

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Date:	Thu,  9 Apr 2015 16:44:48 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Mark Brown <broonie@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 040/176] ASoC: sigmadsp: Refuse to load firmware files with a non-supported version

From: Lars-Peter Clausen <lars@...afoo.de>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 50c0f21b42dd4cd02b51f82274f66912d9a7fa32 upstream.

Make sure to check the version field of the firmware header to make sure to
not accidentally try to parse a firmware file with a different layout.
Trying to do so can result in loading invalid firmware code to the device.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 sound/soc/codecs/sigmadsp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c
index 4068f24..bb3878c 100644
--- a/sound/soc/codecs/sigmadsp.c
+++ b/sound/soc/codecs/sigmadsp.c
@@ -176,6 +176,13 @@ static int _process_sigma_firmware(struct device *dev,
 		goto done;
 	}
 
+	if (ssfw_head->version != 1) {
+		dev_err(dev,
+			"Failed to load firmware: Invalid version %d. Supported firmware versions: 1\n",
+			ssfw_head->version);
+		goto done;
+	}
+
 	crc = crc32(0, fw->data + sizeof(*ssfw_head),
 			fw->size - sizeof(*ssfw_head));
 	pr_debug("%s: crc=%x\n", __func__, crc);
-- 
1.9.1

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