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i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr

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[ Upstream commit a0692f0eef ]

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: 838bfa6049 ("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>
This commit is contained in:
Yingjoe Chen 2019-05-07 22:20:32 +08:00 committed by Greg Kroah-Hartman
parent d704ffa628
commit 8bf2a24467
1 changed files with 1 additions and 0 deletions
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drivers/i2c/i2c-dev.c
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@ -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;
}