[PATCH AUTOSEL 4.14 51/87] ALSA: snd-aoa: add of_node_put() in error path

From: Sasha Levin
Date: Sun Sep 16 2018 - 23:21:58 EST

From: Nicholas Mc Guire <hofrat@xxxxxxxxx>

[ Upstream commit 222bce5eb88d1af656419db04bcd84b2419fb900 ]

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@xxxxxxxxx>
Fixes: commit f3d9478b2ce4 ("[ALSA] snd-aoa: add snd-aoa")
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
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 71960089e207..65557421fe0b 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;