linux-kernel - [ 82/95] Input: cyttsp

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Message-Id: <20130625182202.838216788@linuxfoundation.org>
Date:	Tue, 25 Jun 2013 11:33:09 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ferruh Yigit <fery@...ress.com>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [ 82/95] Input: cyttsp - fix memcpy size param

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

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

From: Ferruh Yigit <fery@...ress.com>

commit d2983cdb480157f637df07723f28aaa657b1080d upstream.

memcpy param is wrong because of offset in bl_cmd, this may corrupt the
stack which may cause a crash.

Tested-by: Ferruh Yigit <fery@...ress.com> on TMA300-DVK
Signed-off-by: Ferruh Yigit <fery@...ress.com>
Acked-by: Javier Martinez Canillas <javier@...hile0.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/touchscreen/cyttsp_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -133,7 +133,7 @@ static int cyttsp_exit_bl_mode(struct cy
 	memcpy(bl_cmd, bl_command, sizeof(bl_command));
 	if (ts->pdata->bl_keys)
 		memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
-			ts->pdata->bl_keys, sizeof(bl_command));
+			ts->pdata->bl_keys, CY_NUM_BL_KEYS);
 
 	error = ttsp_write_block_data(ts, CY_REG_BASE,
 				      sizeof(bl_cmd), bl_cmd);


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