linux-kernel - [PATCH] video: fbdev: Fix refcount leak in clcdfb_of_vram

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Message-Id: <20220512115913.48685-1-linmq006@gmail.com>
Date:   Thu, 12 May 2022 15:59:08 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Russell King <linux@...linux.org.uk>, Helge Deller <deller@....de>,
        Miaoqian Lin <linmq006@...il.com>,
        Pawel Moll <pawel.moll@....com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] video: fbdev: Fix refcount leak in clcdfb_of_vram_setup

of_parse_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: d10715be03bd ("video: ARM CLCD: Add DT support")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/video/fbdev/amba-clcd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index 9ec969e136bf..8080116aea84 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -758,12 +758,15 @@ static int clcdfb_of_vram_setup(struct clcd_fb *fb)
 		return -ENODEV;
 
 	fb->fb.screen_base = of_iomap(memory, 0);
-	if (!fb->fb.screen_base)
+	if (!fb->fb.screen_base) {
+		of_node_put(memory);
 		return -ENOMEM;
+	}
 
 	fb->fb.fix.smem_start = of_translate_address(memory,
 			of_get_address(memory, 0, &size, NULL));
 	fb->fb.fix.smem_len = size;
+	of_node_put(memory);
 
 	return 0;
 }
-- 
2.25.1