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From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: linux-media@vger.kernel.org
Cc: hverkuil@xs4all.nl, laurent.pinchart@ideasonboard.com,
	jacopo@jmondi.org, niklas.soderlund@ragnatech.se
Subject: [PATCH v2 1/9] davinci-vpif: Don't dereference endpoint after putting it, fix refcounting
Date: Thu,  6 Jun 2019 16:02:17 +0300
Message-ID: <20190606130225.10751-2-sakari.ailus@linux.intel.com> (raw)
In-Reply-To: <20190606130225.10751-1-sakari.ailus@linux.intel.com>

The davinci-vpif driver dereferences its local endpoints after releasing
the reference to them.

The driver also puts its endpoints explicitly while the
of_graph_get_next_endpoint() does that, too, leading to obtaining a
reference once and releasing it twice.

Both are fixed by this patch.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/platform/davinci/vpif_capture.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index b5aacb0fb96b..72bdb3c10962 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -1555,7 +1555,6 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 		if (!rem) {
 			dev_dbg(&pdev->dev, "Remote device at %pOF not found\n",
 				endpoint);
-			of_node_put(endpoint);
 			goto done;
 		}
 
@@ -1567,7 +1566,6 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 					    GFP_KERNEL);
 		if (!chan->inputs) {
 			of_node_put(rem);
-			of_node_put(endpoint);
 			goto err_cleanup;
 		}
 
@@ -1578,7 +1576,6 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 
 		err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint),
 						 &bus_cfg);
-		of_node_put(endpoint);
 		if (err) {
 			dev_err(&pdev->dev, "Could not parse the endpoint\n");
 			of_node_put(rem);
@@ -1609,6 +1606,7 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 	}
 
 done:
+	of_node_put(endpoint);
 	pdata->asd_sizes[0] = i;
 	pdata->subdev_count = i;
 	pdata->card_name = "DA850/OMAP-L138 Video Capture";
@@ -1616,6 +1614,7 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 	return pdata;
 
 err_cleanup:
+	of_node_put(endpoint);
 	v4l2_async_notifier_cleanup(&vpif_obj.notifier);
 
 	return NULL;
-- 
2.11.0


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-06 13:02 [PATCH v2 0/9] Rework V4L2 fwnode parsing; add defaults and avoid iteration Sakari Ailus
2019-06-06 13:02 ` Sakari Ailus [this message]
2019-06-06 13:02 ` [PATCH v2 2/9] v4l2-async: Use endpoint node, not device node, for fwnode match Sakari Ailus
2019-06-14 15:45   ` Jacopo Mondi
2019-06-14 21:21   ` Niklas Söderlund
2019-06-21  9:19     ` Jacopo Mondi
2019-06-21 11:43       ` Niklas Söderlund
2019-06-28  8:29     ` Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 3/9] v4l2-async: Get fwnode reference when putting it to the notifier's list Sakari Ailus
2019-06-14 16:01   ` Jacopo Mondi
2019-06-28 11:35     ` Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 4/9] v4l2-async: Add v4l2_async_notifier_add_fwnode_remote_subdev Sakari Ailus
2019-06-14 16:14   ` Jacopo Mondi
2019-06-28 11:47     ` Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 5/9] omap3isp: Rework OF endpoint parsing Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 6/9] v4l2-async: Safely clean up an uninitialised notifier Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 7/9] ipu3-cio2: Clean up notifier's subdev list if parsing endpoints fails Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 8/9] ipu3-cio2: Proceed with notifier init even if there are no subdevs Sakari Ailus
2019-06-06 13:02 ` [PATCH v2 9/9] ipu3-cio2: Parse information from firmware without using callbacks Sakari Ailus
2019-06-14 16:31   ` Jacopo Mondi
2019-06-28 11:57     ` Sakari Ailus

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