From a0692f0eef91354b62c2b4c94954536536be5425 Mon Sep 17 00:00:00 2001
From: Yingjoe Chen <yingjoe.chen@mediatek.com>
Date: Tue, 7 May 2019 22:20:32 +0800
Subject: [PATCH] i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr
Git-commit: a0692f0eef91354b62c2b4c94954536536be5425
Patch-mainline: v5.2-rc3
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/i2c/i2c-dev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -297,6 +297,7 @@ static noinline int i2cdev_ioctl_rdwr(st
 			    rdwr_pa[i].buf[0] < 1 ||
 			    rdwr_pa[i].len < rdwr_pa[i].buf[0] +
 					     I2C_SMBUS_BLOCK_MAX) {
+				i++;
 				res = -EINVAL;
 				break;
 			}