Patch "i2c: fix kernel memory disclosure in dev interface" has been added to the 4.9-stable tree

Patch "i2c: fix kernel memory disclosure in dev interface" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    i2c: fix kernel memory disclosure in dev interface

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-fix-kernel-memory-disclosure-in-dev-interface.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 30f939feaeee23e21391cfc7b484f012eb189c3c Mon Sep 17 00:00:00 2001
From: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Date: Mon, 9 Jan 2017 22:53:36 +0700
Subject: i2c: fix kernel memory disclosure in dev interface

From: Vlad Tsyrklevich <vlad@tsyrklevich.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@tsyrklevich.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -331,7 +331,7 @@ 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,


Patches currently in stable-queue which might be from vlad@tsyrklevich.net are

queue-4.9/i2c-fix-kernel-memory-disclosure-in-dev-interface.patch