linux-kernel - [PATCH 12/13] nvmem: core: Fix device reference leak

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Message-Id: <20190128155506.25566-13-srinivas.kandagatla@linaro.org>
Date:   Mon, 28 Jan 2019 15:55:05 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 12/13] nvmem: core: Fix device reference leak

From: Alban Bedel <albeu@...e.fr>

__nvmem_device_get() make use of bus_find_device() to get the relevant
device and this function increase the reference count of the device
found, however this is not accounted for anywhere. Fix
__nvmem_device_get() and __nvmem_device_put() to properly release this
reference count.

Signed-off-by: Alban Bedel <albeu@...e.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 1752768dd2d2..5400017ef616 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -811,6 +811,7 @@ static struct nvmem_device *__nvmem_device_get(struct device_node *np,
 			"could not increase module refcount for cell %s\n",
 			nvmem_dev_name(nvmem));
 
+		put_device(&nvmem->dev);
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -821,6 +822,7 @@ static struct nvmem_device *__nvmem_device_get(struct device_node *np,
 
 static void __nvmem_device_put(struct nvmem_device *nvmem)
 {
+	put_device(&nvmem->dev);
 	module_put(nvmem->owner);
 	kref_put(&nvmem->refcnt, nvmem_device_release);
 }
-- 
2.20.1