linux-kernel - [PATCH 3.16 013/328] ALSA: snd-aoa: add of_node

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Message-ID: <lsq.1544392233.938062792@decadent.org.uk>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Takashi Iwai" <tiwai@...e.de>,
        "Nicholas Mc Guire" <hofrat@...dl.org>
Subject: [PATCH 3.16 013/328] ALSA: snd-aoa: add of_node_put() in error path

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Mc Guire <hofrat@...dl.org>

commit 222bce5eb88d1af656419db04bcd84b2419fb900 upstream.

 Both calls to of_find_node_by_name() and of_get_next_child() return a
node pointer with refcount incremented thus it must be explicidly
decremented here after the last usage. As we are assured to have a
refcounted  np  either from the initial
of_find_node_by_name(NULL, name); or from the of_get_next_child(gpio, np)
in the while loop if we reached the error code path below, an
x of_node_put(np) is needed.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Fixes: commit f3d9478b2ce4 ("[ALSA] snd-aoa: add snd-aoa")
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/aoa/core/gpio-feature.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/aoa/core/gpio-feature.c
+++ b/sound/aoa/core/gpio-feature.c
@@ -88,8 +88,10 @@ static struct device_node *get_gpio(char
 	}

 	reg = of_get_property(np, "reg", NULL);
-	if (!reg)
+	if (!reg) {
+		of_node_put(np);
 		return NULL;
+	}

 	*gpioptr = *reg;