Re: [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver

[Heiko Carstens <hca@linux.ibm.com>]

On Mon, Mar 20, 2023 at 11:04:47AM -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@linux.ibm.com>
> Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_drv.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied.