[PATCH 3.16 31/87] i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr

[Ben Hutchings]

3.16.75-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Yingjoe Chen <yingjoe.c...@mediatek.com>

commit a0692f0eef91354b62c2b4c94954536536be5425 upstream.

If I2C_M_RECV_LEN check failed, msgs[i].buf allocated by memdup_user
will not be freed. Pump index up so it will be freed.

Fixes: 838bfa6049fb ("i2c-dev: Add support for I2C_M_RECV_LEN")
Signed-off-by: Yingjoe Chen <yingjoe.c...@mediatek.com>
Signed-off-by: Wolfram Sang <w...@the-dreams.de>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/i2c/i2c-dev.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -300,6 +300,7 @@ static noinline int i2cdev_ioctl_rdrw(st
                            rdwr_pa[i].buf[0] < 1 ||
                            rdwr_pa[i].len < rdwr_pa[i].buf[0] +
                                             I2C_SMBUS_BLOCK_MAX) {
+                               i++;
                                res = -EINVAL;
                                break;
                        }