media: platform: exynos4-is: Fix an OF node reference leak in fimc_md_is_isp_available

commit 8964eb23408243ae0016d1f8473c76f64ff25d20 upstream.

In fimc_md_is_isp_available(), of_get_child_by_name() is called to check
if FIMC-IS is available. Current code does not decrement the refcount of
the returned device node, which causes an OF node reference leak. Fix it
by calling of_node_put() at the end of the variable scope.

Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Fixes: e781bbe3fecf ("[media] exynos4-is: Add fimc-is subdevs registration")
Cc: stable@vger.kernel.org
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
[hverkuil: added CC to stable]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/platform/samsung/exynos4-is/media-dev.h b/drivers/media/platform/samsung/exynos4-is/media-dev.h
index 786264cf79dc144cc29e0bf189df02cfd64d2cfe..a50e58ab7ef7733c63929ce41903cf6f38787c16 100644 (file)
--- a/drivers/media/platform/samsung/exynos4-is/media-dev.h
+++ b/drivers/media/platform/samsung/exynos4-is/media-dev.h
@@ -178,8 +178,9 @@ int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on);
 #ifdef CONFIG_OF
 static inline bool fimc_md_is_isp_available(struct device_node *node)
 {
-       node = of_get_child_by_name(node, FIMC_IS_OF_NODE_NAME);
-       return node ? of_device_is_available(node) : false;
+       struct device_node *child __free(device_node) =
+               of_get_child_by_name(node, FIMC_IS_OF_NODE_NAME);
+       return child ? of_device_is_available(child) : false;
 }
 #else
 #define fimc_md_is_isp_available(node) (false)