[PATCH v4] driver: uio: fix possible memory leak in uio_open

[Liu Jian]

If 'idev->info' is NULL, we need to  free 'listerner'

Fixes: 57c5f4df0a5a ("uio: fix crash after the device is unregistered")
Signed-off-by: Liu Jian <liujian56@xxxxxxxxxx>
---
v1->v2:
rename the "err_infoopen" to "err_idev_info"
v2->3:
put the extra info after the "--"
v3-v4:
add git log

 drivers/uio/uio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 1313422..b4ae2d9 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -491,18 +491,19 @@ static int uio_open(struct inode *inode, struct file *filep)
 	if (!idev->info) {
 		mutex_unlock(&idev->info_lock);
 		ret = -EINVAL;
-		goto err_alloc_listener;
+		goto err_idev_info;
 	}
 
 	if (idev->info && idev->info->open)
 		ret = idev->info->open(idev->info, inode);
 	mutex_unlock(&idev->info_lock);
 	if (ret)
-		goto err_infoopen;
+		goto err_idev_info;
 
 	return 0;
 
-err_infoopen:
+err_idev_info:
+	filep->private_data = NULL;
 	kfree(listener);
 
 err_alloc_listener:
-- 
2.7.4