linux-kernel - [PATCH 3.12 16/39] staging/dgnc: fix info leak in ioctl

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Message-Id: <39c9944afb08c26ff36ae1967497d44fcf5a87ed.1453722244.git.jslaby@suse.cz>
Date:	Mon, 25 Jan 2016 12:49:57 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Salva Peiró <speirofr@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yuki Machida <machida.yuki@...fujitsu.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 16/39] staging/dgnc: fix info leak in ioctl

From: Salva Peiró <speirofr@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 4b6184336ebb5c8dc1eae7f7ab46ee608a748b05 upstream.

The dgnc_mgmt_ioctl() code fails to initialize the 16 _reserved bytes of
struct digi_dinfo after the ->dinfo_nboards member. Add an explicit
memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Salva Peiró <speirofr@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Yuki Machida <machida.yuki@...fujitsu.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/staging/dgnc/dgnc_mgmt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/dgnc/dgnc_mgmt.c b/drivers/staging/dgnc/dgnc_mgmt.c
index c4629d7c80b2..d885bbb7de60 100644
--- a/drivers/staging/dgnc/dgnc_mgmt.c
+++ b/drivers/staging/dgnc/dgnc_mgmt.c
@@ -145,6 +145,7 @@ long dgnc_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		DGNC_LOCK(dgnc_global_lock, lock_flags);
 
+		memset(&ddi, 0, sizeof(ddi));
 		ddi.dinfo_nboards = dgnc_NumBoards;
 		sprintf(ddi.dinfo_version, "%s", DG_PART);
 
-- 
2.7.0