linux-kernel - [PATCH 1/8] char: applicom: fix information leak to userland

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Date:	Sun, 17 Oct 2010 18:41:12 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Julia Lawall <julia@...u.dk>, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] char: applicom: fix information leak to userland

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

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

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

diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c
index e7ba774..25373df 100644
--- a/drivers/char/applicom.c
+++ b/drivers/char/applicom.c
@@ -566,6 +566,7 @@ static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_
 				struct mailbox mailbox;
 
 				/* Got a packet for us */
+				memset(&st_loc, 0, sizeof(st_loc));
 				ret = do_ac_read(i, buf, &st_loc, &mailbox);
 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
 				set_current_state(TASK_RUNNING);
-- 
1.7.0.4

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