linux-kernel - [PATCH 3.10 098/268] i2c: fix kernel memory disclosure in dev interface

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Message-Id: <1497897167-14556-99-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:29:57 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Vlad Tsyrklevich <vlad@...rklevich.net>,
        Wolfram Sang <wsa@...-dreams.de>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 098/268] i2c: fix kernel memory disclosure in dev interface

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: Willy Tarreau <w@....eu>
---
 drivers/i2c/i2c-dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index c3ccdea..fa3ecec 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -328,7 +328,7 @@ static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
 		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,
-- 
2.8.0.rc2.1.gbe9624a