Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Mauro Carvalho Chehab <mchehab@s-opensource.com>
Subject: [PATCH 4.9 43/88] media: v4l2-compat-ioctl32.c: make ctrl_is_pointer work for subdevs
Date:   Thu, 15 Feb 2018 16:17:10 +0100
Message-Id: <20180215151228.632424300@linuxfoundation.org>
In-Reply-To: <20180215151222.437136975@linuxfoundation.org>
References: <20180215151222.437136975@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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

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

From: Hans Verkuil <hansverk@cisco.com>

commit 273caa260035c03d89ad63d72d8cd3d9e5c5e3f1 upstream.

If the device is of type VFL_TYPE_SUBDEV then vdev->ioctl_ops
is NULL so the 'if (!ops->vidioc_query_ext_ctrl)' check would crash.
Add a test for !ops to the condition.

All sub-devices that have controls will use the control framework,
so they do not have an equivalent to ops->vidioc_query_ext_ctrl.
Returning false if ops is NULL is the correct thing to do here.

Fixes: b8c601e8af ("v4l2-compat-ioctl32.c: fix ctrl_is_pointer")

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -612,7 +612,7 @@ static inline bool ctrl_is_pointer(struc
 		return ctrl && ctrl->is_ptr;
 	}
 
-	if (!ops->vidioc_query_ext_ctrl)
+	if (!ops || !ops->vidioc_query_ext_ctrl)
 		return false;
 
 	return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&