linux-kernel - [PATCH 3.14 038/238] i2c: ismt: use correct length when copy buffer

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Message-Id: <20141003212914.882109795@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:29:13 -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, Fan Du <fan.du@...el.com>,
	Neil Horman <nhorman@...driver.com>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH 3.14 038/238] i2c: ismt: use correct length when copy buffer

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

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

From: Fan Du <fan.du@...el.com>

commit 979bbf7b7ae75cfc06e09d09eda38009a3bdc4a4 upstream.

In block write mode, when encapsulating dma_buffer, first element is
'command', the rest is data buffer, so only copy actual data buffer
starting from block[1] with the size indicating by block[0].

Signed-off-by: Fan Du <fan.du@...el.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-ismt.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/i2c/busses/i2c-ismt.c
+++ b/drivers/i2c/busses/i2c-ismt.c
@@ -497,7 +497,7 @@ static int ismt_access(struct i2c_adapte
 			desc->wr_len_cmd = dma_size;
 			desc->control |= ISMT_DESC_BLK;
 			priv->dma_buffer[0] = command;
-			memcpy(&priv->dma_buffer[1], &data->block[1], dma_size);
+			memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1);
 		} else {
 			/* Block Read */
 			dev_dbg(dev, "I2C_SMBUS_BLOCK_DATA:  READ\n");
@@ -525,7 +525,7 @@ static int ismt_access(struct i2c_adapte
 			desc->wr_len_cmd = dma_size;
 			desc->control |= ISMT_DESC_I2C;
 			priv->dma_buffer[0] = command;
-			memcpy(&priv->dma_buffer[1], &data->block[1], dma_size);
+			memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1);
 		} else {
 			/* i2c Block Read */
 			dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA:  READ\n");


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