On Wednesday 28 February 2018 04:00 PM, Cornelia Huck wrote:

On Wed, 28 Feb 2018 15:24:16 +0530
Arvind Yadav [off-list ref] wrote:

quoted

Free memory, if afiucv_iucv_init is not successful and
removing a IUCV driver.

Signed-off-by: Arvind Yadav <redacted>
---
  net/iucv/af_iucv.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 1e8cc7b..eb0995a 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c

@@ -2433,9 +2433,11 @@ static int afiucv_iucv_init(void)
  	af_iucv_dev->driver = &af_iucv_driver;
  	err = device_register(af_iucv_dev);
  	if (err)
-		goto out_driver;
+		goto out_iucv_dev;
  	return 0;
  
+out_iucv_dev:
+	kfree(af_iucv_dev);
  out_driver:
  	driver_unregister(&af_iucv_driver);
  out_iucv:

@@ -2496,6 +2498,7 @@ static void __exit afiucv_exit(void)
  {
  	if (pr_iucv) {
  		device_unregister(af_iucv_dev);
+		kfree(af_iucv_dev);
  		driver_unregister(&af_iucv_driver);
  		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
  		symbol_put(iucv_if);

No, you must not use kfree() after you called device_register() (even
if it was not successful!) -- see the comment for device_register().

Yes, Your are right. First we need to call put_device() then kfree().
I will send updated patch.
~arvind