i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr

[ Upstream commit a0692f0eef91354b62c2b4c94954536536be5425 ]

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.chen@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 00e8e675cbebfd681cd0d1358fbdf9755da8258d..eaa312bc3a3ce91508cb9d03db7155467b0797b6 100644 (file)
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -297,6 +297,7 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
                            rdwr_pa[i].buf[0] < 1 ||
                            rdwr_pa[i].len < rdwr_pa[i].buf[0] +
                                             I2C_SMBUS_BLOCK_MAX) {
+                               i++;
                                res = -EINVAL;
                                break;
                        }