linux-kernel - [PATCH] ALSA: snd-aoa: add of_node

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Date:   Fri, 29 Jun 2018 19:07:42 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        linuxppc-dev@...ts.ozlabs.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] ALSA: snd-aoa: add of_node_put() in error path

 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")
---

Problem located by an experimental coccinelle script

Patch was compiletested with: ppc64_defconfig (implies CONFIG_SND_AOA=m)

Patch is against 4.18-rc2 (localversion-next is next-20180629)

 sound/aoa/core/gpio-feature.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/aoa/core/gpio-feature.c b/sound/aoa/core/gpio-feature.c
index 7196008..6555742 100644
--- 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 *name,
 	}
 
 	reg = of_get_property(np, "reg", NULL);
-	if (!reg)
+	if (!reg) {
+		of_node_put(np);
 		return NULL;
+	}
 
 	*gpioptr = *reg;
 
-- 
2.1.4