linux-kernel - [PATCH] video: clps711x-fb: release disp device node in probe()

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Message-Id: <1541197423-31560-1-git-send-email-khoroshilov@ispras.ru>
Date:   Sat,  3 Nov 2018 01:23:43 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Alexander Shiyan <shc_work@...l.ru>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] video: clps711x-fb: release disp device node in probe()

clps711x_fb_probe() increments refcnt of disp device node by
of_parse_phandle() and leaves it undecremented on both
successful and error paths.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/video/fbdev/clps711x-fb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/clps711x-fb.c b/drivers/video/fbdev/clps711x-fb.c
index ff561073ee4e..42f909618f04 100644
--- a/drivers/video/fbdev/clps711x-fb.c
+++ b/drivers/video/fbdev/clps711x-fb.c
@@ -287,14 +287,17 @@ static int clps711x_fb_probe(struct platform_device *pdev)
 	}
 
 	ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE);
-	if (ret)
+	if (ret) {
+		of_node_put(disp);
 		goto out_fb_release;
+	}
 
 	of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale);
 	cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert");
 
 	ret = of_property_read_u32(disp, "bits-per-pixel",
 				   &info->var.bits_per_pixel);
+	of_node_put(disp);
 	if (ret)
 		goto out_fb_release;
 
-- 
2.7.4