linux-kernel - [PATCH 6/8] char: synclink: fix information leak to userland

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Date:	Sun, 17 Oct 2010 18:41:32 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] char: synclink: fix information leak to userland

Structure new_line is copied to userland with some padding fields unitialized.
It leads to leaking of stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 Compile tested.

 drivers/char/synclink.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 3a6824f..abd0867 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -7846,6 +7846,8 @@ static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	if (cmd != SIOCWANDEV)
 		return hdlc_ioctl(dev, ifr, cmd);
 
+	memset(&new_line, 0, size);
+
 	switch(ifr->ifr_settings.type) {
 	case IF_GET_IFACE: /* return current sync_serial_settings */
 
-- 
1.7.0.4

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