linux-kernel - [PATCH 3.15 048/122] drm: fix NULL pointer access by wrong ioctl

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Message-Id: <20140707235735.725289062@linuxfoundation.org>
Date:	Mon,  7 Jul 2014 16:56:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Zhaowei Yuan <zhaowei.yuan@...sung.com>,
	David Herrmann <dh.herrmann@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [PATCH 3.15 048/122] drm: fix NULL pointer access by wrong ioctl

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

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

From: Zhaowei Yuan <zhaowei.yuan@...sung.com>

commit 1539fb9bd405ee32282ea0a38404f9e008ac5b7a upstream.

If user uses wrong ioctl command with _IOC_NONE and argument size
greater than 0, it can cause NULL pointer access from memset of line
463. If _IOC_NONE, don't memset to 0 for kdata.

Signed-off-by: Zhaowei Yuan <zhaowei.yuan@...sung.com>
Reviewed-by: David Herrmann <dh.herrmann@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/drm_drv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -419,8 +419,9 @@ long drm_ioctl(struct file *filp,
 			retcode = -EFAULT;
 			goto err_i1;
 		}
-	} else
+	} else if (cmd & IOC_OUT) {
 		memset(kdata, 0, usize);
+	}
 
 	if (ioctl->flags & DRM_UNLOCKED)
 		retcode = func(dev, kdata, file_priv);


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