linux-kernel - [PATCH 3.2 112/199] i2c: fix kernel memory disclosure in dev interface

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Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Wolfram Sang" <wsa@...-dreams.de>,
        "Vlad Tsyrklevich" <vlad@...rklevich.net>
Subject: [PATCH 3.2 112/199] i2c: fix kernel memory disclosure in dev
 interface

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

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

From: Vlad Tsyrklevich <vlad@...rklevich.net>

commit 30f939feaeee23e21391cfc7b484f012eb189c3c upstream.

i2c_smbus_xfer() does not always fill an entire block, allowing
kernel stack memory disclosure through the temp variable. Clear
it before it's read to.

Signed-off-by: Vlad Tsyrklevich <vlad@...rklevich.net>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/i2c/i2c-dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -310,7 +310,7 @@ static noinline int i2cdev_ioctl_smbus(s
 		unsigned long arg)
 {
 	struct i2c_smbus_ioctl_data data_arg;
-	union i2c_smbus_data temp;
+	union i2c_smbus_data temp = {};
 	int datasize, res;
 
 	if (copy_from_user(&data_arg,