linux-kernel - [PATCH] nvmem: core: Fix a potential use after free

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Date:   Fri, 27 Dec 2019 09:20:34 +0000
From:   Xu Wang <vulab@...as.ac.cn>
To:     srinivas.kandagatla@...aro.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] nvmem: core: Fix a potential use after free

Free the nvmem structure only after we are done using it.
This patch just moves the put_device() down a bit to avoid the
use after free.

Signed-off-by: Xu Wang <vulab@...as.ac.cn>
---
 drivers/nvmem/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 9f1ee9c..7051d34 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -535,8 +535,8 @@ static struct nvmem_device *__nvmem_device_get(void *data,
 
 static void __nvmem_device_put(struct nvmem_device *nvmem)
 {
-	put_device(&nvmem->dev);
 	module_put(nvmem->owner);
+	put_device(&nvmem->dev);
 	kref_put(&nvmem->refcnt, nvmem_device_release);
 }
 
-- 
2.7.4