5.1-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 4.14.111 / crypto-crypto4xx-add-missing-of_node_put-after-of_de.patch

From d4fd7535d0d5d181e52a5f61f063d4c07a080357 Mon Sep 17 00:00:00 2001
From: Julia Lawall <Julia.Lawall@lip6.fr>
Date: Sat, 23 Feb 2019 14:20:39 +0100
Subject: crypto: crypto4xx - add missing of_node_put after
 of_device_is_available

[ Upstream commit 8c2b43d2d85b48a97d2f8279278a4aac5b45f925 ]

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: 5343e674f32fb ("crypto4xx: integrate ppc4xx-rng into crypto4xx")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/amcc/crypto4xx_trng.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/amcc/crypto4xx_trng.c b/drivers/crypto/amcc/crypto4xx_trng.c
index 677ca17fd223..368c5599515e 100644
--- a/drivers/crypto/amcc/crypto4xx_trng.c
+++ b/drivers/crypto/amcc/crypto4xx_trng.c
@@ -80,8 +80,10 @@ void ppc4xx_trng_probe(struct crypto4xx_core_device *core_dev)
 
 	/* Find the TRNG device node and map it */
 	trng = of_find_matching_node(NULL, ppc4xx_trng_match);
-	if (!trng || !of_device_is_available(trng))
+	if (!trng || !of_device_is_available(trng)) {
+		of_node_put(trng);
 		return;
+	}
 
 	dev->trng_base = of_iomap(trng, 0);
 	of_node_put(trng);
-- 
2.19.1