linux-kernel - [72/89] V4L/DVB: Video : pwc : Fix regression in pwc_set_shutter_speed caused by bad constant => sizeof conversion.

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Message-Id: <20100330225853.461694959@linux.site>
Date:	Tue, 30 Mar 2010 15:58:14 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Martin Fuzzey <mfuzzey@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [72/89] V4L/DVB: Video : pwc : Fix regression in pwc_set_shutter_speed caused by bad 	constant => sizeof conversion.

2.6.31-stable review patch.  If anyone has any objections, please let us know.

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

From: Martin Fuzzey <mfuzzey@...il.com>

commit 53f68607caba85db9a73846ccd289e4b7fa96295 upstream.

Regression was caused by my commit 6b35ca0d3d586b8ecb8396821af21186e20afaf0
which determined message size using sizeof rather than hardcoded constants.

Unfortunately pwc_set_shutter_speed reuses a 2 byte buffer for a one byte
message too so the sizeof was bogus in this case.

All other uses of sizeof checked and are ok.

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Martin Fuzzey <mfuzzey@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/media/video/pwc/pwc-ctrl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/video/pwc/pwc-ctrl.c
+++ b/drivers/media/video/pwc/pwc-ctrl.c
@@ -753,7 +753,7 @@ int pwc_set_shutter_speed(struct pwc_dev
 		buf[0] = 0xff; /* fixed */
 
 	ret = send_control_msg(pdev,
-		SET_LUM_CTL, SHUTTER_MODE_FORMATTER, &buf, sizeof(buf));
+		SET_LUM_CTL, SHUTTER_MODE_FORMATTER, &buf, 1);
 
 	if (!mode && ret >= 0) {
 		if (value < 0)


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