Re: [PATCH] s390/vfio_ap: fix memory leak in vfio_ap device driver

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On 3/16/23 4:39 AM, Heiko Carstens wrote:
On Wed, Mar 15, 2023 at 11:39:32AM -0400, Tony Krowiak wrote:
The device release callback function invoked to release the matrix device
uses the dev_get_drvdata(device *dev) function to retrieve the
pointer to the vfio_matrix_dev object in order to free its storage. The
problem is, this object is not stored as drvdata with the device; since the
kfree function will accept a NULL pointer, the memory for the
vfio_matrix_dev object is never freed.

Since the device being released is contained within the vfio_matrix_dev
object, the container_of macro will be used to retrieve its pointer.

Fixes: 1fde573413b5 ("s390: vfio-ap: base implementation of VFIO AP device driver")
Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
  drivers/s390/crypto/vfio_ap_drv.c | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index 997b524bdd2b..15e9de9f4574 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -54,8 +54,9 @@ static struct ap_driver vfio_ap_drv = {
static void vfio_ap_matrix_dev_release(struct device *dev)
  {
-	struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
-
+	struct ap_matrix_dev *matrix_dev = container_of(dev,
+							struct ap_matrix_dev,
+							device);
  	kfree(matrix_dev);
Could you keep this code more readable, including adding the missing
blank line after the declaration, please? Something like:

static void vfio_ap_matrix_dev_release(struct device *dev)
{
	struct ap_matrix_dev *matrix_dev;

	matrix_dev = container_of(dev, struct ap_matrix_dev, device);
	kfree(matrix_dev);
}

Thanks!


Will do.





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