linux-kernel - [PATCH 3.12 170/235] powerpc/ibmebus: Fix device reference leaks in sysfs interface

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Message-Id: <cffd4016550a3612b0534974e4bfebc303d48815.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:55:03 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 170/235] powerpc/ibmebus: Fix device reference leaks in sysfs interface

From: Johan Hovold <johan@...nel.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit fe0f3168169f7c34c29b0cf0c489f126a7f29643 upstream.

Make sure to drop any reference taken by bus_find_device() in the sysfs
callbacks that are used to create and destroy devices based on
device-tree entries.

Fixes: 6bccf755ff53 ("[POWERPC] ibmebus: dynamic addition/removal of adapters, some code cleanup")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/powerpc/kernel/ibmebus.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 435c9bbc6b09..bc47b7986e37 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -266,6 +266,7 @@ static ssize_t ibmebus_store_probe(struct bus_type *bus,
 				   const char *buf, size_t count)
 {
 	struct device_node *dn = NULL;
+	struct device *dev;
 	char *path;
 	ssize_t rc = 0;
 
@@ -273,8 +274,10 @@ static ssize_t ibmebus_store_probe(struct bus_type *bus,
 	if (!path)
 		return -ENOMEM;
 
-	if (bus_find_device(&ibmebus_bus_type, NULL, path,
-			    ibmebus_match_path)) {
+	dev = bus_find_device(&ibmebus_bus_type, NULL, path,
+			      ibmebus_match_path);
+	if (dev) {
+		put_device(dev);
 		printk(KERN_WARNING "%s: %s has already been probed\n",
 		       __func__, path);
 		rc = -EEXIST;
@@ -310,6 +313,7 @@ static ssize_t ibmebus_store_remove(struct bus_type *bus,
 	if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 				   ibmebus_match_path))) {
 		of_device_unregister(to_platform_device(dev));
+		put_device(dev);
 
 		kfree(path);
 		return count;
-- 
2.11.0