linux-kernel - [34-longterm 122/260] drivers/net/usb/hso.c: prevent reading uninitialized memory

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Date:	Sun,  2 Jan 2011 02:16:58 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dan Rosenberg <drosenberg@...curity.com>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 122/260] drivers/net/usb/hso.c: prevent reading uninitialized memory

From: Dan Rosenberg <drosenberg@...curity.com>

commit 7011e660938fc44ed86319c18a5954e95a82ab3e upstream.

Fixed formatting (tabs and line breaks).

The TIOCGICOUNT device ioctl allows unprivileged users to read
uninitialized stack memory, because the "reserved" member of the
serial_icounter_struct struct declared on the stack in hso_get_count()
is not altered or zeroed before being copied back to the user.  This
patch takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/net/usb/hso.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index be0cc99..0ba865e 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -1654,6 +1654,8 @@ static int hso_get_count(struct hso_serial *serial,
 	struct uart_icount cnow;
 	struct hso_tiocmget  *tiocmget = serial->tiocmget;
 
+	memset(&icount, 0, sizeof(struct serial_icounter_struct));
+
 	if (!tiocmget)
 		 return -ENOENT;
 	spin_lock_irq(&serial->serial_lock);
-- 
1.7.3.3

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