linux-kernel - [43/80] firmware: Sigma: Skip header during CRC generation

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Message-Id: <20111207160826.158302123@clark.kroah.org>
Date:	Wed, 07 Dec 2011 08:07:03 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>, Lars-Peter Clausen <lars@...afoo.de>,
	Mike Frysinger <vapier@...too.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [43/80] firmware: Sigma: Skip header during CRC generation

3.0-stable review patch.  If anyone has any objections, please let me know.

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

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

commit c56935bdc0a8edf50237d3b0205133a5b0adc604 upstream.

The firmware header is not part of the CRC, so skip it. Otherwise the firmware
will be rejected due to non-matching CRCs.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Acked-by: Mike Frysinger <vapier@...too.org>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/firmware/sigma.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/firmware/sigma.c
+++ b/drivers/firmware/sigma.c
@@ -130,7 +130,8 @@ int process_sigma_firmware(struct i2c_cl
 	if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
 		goto done;
 
-	crc = crc32(0, fw->data, fw->size);
+	crc = crc32(0, fw->data + sizeof(*ssfw_head),
+			fw->size - sizeof(*ssfw_head));
 	pr_debug("%s: crc=%x\n", __func__, crc);
 	if (crc != ssfw_head->crc)
 		goto done;


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