* [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver
@ 2023-03-20 15:04 Tony Krowiak
2023-03-21 12:47 ` Anthony Krowiak
2023-03-21 13:41 ` Heiko Carstens
0 siblings, 2 replies; 3+ messages in thread
From: Tony Krowiak @ 2023-03-20 15:04 UTC (permalink / raw)
To: linux-s390, linux-kernel
Cc: borntraeger, pasic, jjherne, frankja, david, imbrenda, hca
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(-)
diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index 997b524bdd2b..a48c6938ae68 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;
+ matrix_dev = container_of(dev, struct ap_matrix_dev, device);
kfree(matrix_dev);
}
--
2.31.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver
2023-03-20 15:04 [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver Tony Krowiak
@ 2023-03-21 12:47 ` Anthony Krowiak
2023-03-21 13:41 ` Heiko Carstens
1 sibling, 0 replies; 3+ messages in thread
From: Anthony Krowiak @ 2023-03-21 12:47 UTC (permalink / raw)
To: linux-s390, linux-kernel
Cc: borntraeger, pasic, jjherne, frankja, david, imbrenda, hca
PING!
On 3/20/23 11:04 AM, 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(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
> index 997b524bdd2b..a48c6938ae68 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;
>
> + matrix_dev = container_of(dev, struct ap_matrix_dev, device);
> kfree(matrix_dev);
> }
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver
2023-03-20 15:04 [PATCH v2] s390/vfio_ap: fix memory leak in vfio_ap device driver Tony Krowiak
2023-03-21 12:47 ` Anthony Krowiak
@ 2023-03-21 13:41 ` Heiko Carstens
1 sibling, 0 replies; 3+ messages in thread
From: Heiko Carstens @ 2023-03-21 13:41 UTC (permalink / raw)
To: Tony Krowiak
Cc: linux-s390, linux-kernel, borntraeger, pasic, jjherne, frankja,
david, imbrenda
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-03-21 13:41 ` Heiko Carstens
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