linux-kernel - [PATCH 3.19.y-ckt 004/155] staging/dgnc: fix info leak in ioctl

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Date:	Thu, 12 Nov 2015 15:15:58 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Salva Peiró <speirofr@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 004/155] staging/dgnc: fix info leak in ioctl

3.19.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: =?UTF-8?q?Salva=20Peir=C3=B3?= <speirofr@...il.com>

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>
Reference: CVE-2015-7885
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 5544a8e..78a8767 100644
--- a/drivers/staging/dgnc/dgnc_mgmt.c
+++ b/drivers/staging/dgnc/dgnc_mgmt.c
@@ -133,6 +133,7 @@ long dgnc_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		spin_lock_irqsave(&dgnc_global_lock, flags);
 
+		memset(&ddi, 0, sizeof(ddi));
 		ddi.dinfo_nboards = dgnc_NumBoards;
 		sprintf(ddi.dinfo_version, "%s", DG_PART);
 
-- 
1.9.1

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