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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Steven Price <steven.price@arm.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 079/236] drm/of: free the iterator object on failure
Date:   Mon, 13 Sep 2021 15:13:04 +0200
Message-Id: <20210913131103.044419599@linuxfoundation.org>
In-Reply-To: <20210913131100.316353015@linuxfoundation.org>
References: <20210913131100.316353015@linuxfoundation.org>
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From: Steven Price <steven.price@arm.com>

[ Upstream commit 6f9223a56fabc840836b49de27dc7b27642c6a32 ]

When bailing out due to the sanity check the iterator value needs to be
freed because the early return prevents for_each_child_of_node() from
doing the dereference itself.

Fixes: 6529007522de ("drm: of: Add drm_of_lvds_get_dual_link_pixel_order")
Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210714143300.20632-1-steven.price@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/drm_of.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 197c57477344..997b8827fed2 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -331,8 +331,10 @@ static int drm_of_lvds_get_remote_pixels_type(
 		 * configurations by passing the endpoints explicitly to
 		 * drm_of_lvds_get_dual_link_pixel_order().
 		 */
-		if (!current_pt || pixels_type != current_pt)
+		if (!current_pt || pixels_type != current_pt) {
+			of_node_put(endpoint);
 			return -EINVAL;
+		}
 	}
 
 	return pixels_type;
-- 
2.30.2