linux-kernel - [ 071/184] staging: comedi: s626: dont dereference insn->data

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Message-Id: <20130604172133.249243991@1wt.eu>
Date:	Tue, 04 Jun 2013 19:22:41 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Ian Abbott <abbotti@....co.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 071/184] staging: comedi: s626: dont dereference insn->data

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Ian Abbott <abbotti@....co.uk>

commit b655c2c4782ed3e2e71d2608154e295a3e860311 upstream.

`s626_enc_insn_config()` is incorrectly dereferencing `insn->data` which
is a pointer to user memory.  It should be dereferencing the separate
`data` parameter that points to a copy of the data in kernel memory.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/staging/comedi/drivers/s626.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 80d2787..7a7c29f 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -2330,7 +2330,7 @@ static int s626_enc_insn_config(struct comedi_device *dev,
 	/*   (data==NULL) ? (Preloadvalue=0) : (Preloadvalue=data[0]); */
 
 	k->SetMode(dev, k, Setup, TRUE);
-	Preload(dev, k, *(insn->data));
+	Preload(dev, k, data[0]);
 	k->PulseIndex(dev, k);
 	SetLatchSource(dev, k, valueSrclatch);
 	k->SetEnable(dev, k, (uint16_t) (enab != 0));
-- 
1.7.12.2.21.g234cd45.dirty



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