6.1-stable review patch. If anyone has any objections, please let me know.
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From: Anthony Krowiak akrowiak@linux.ibm.com
commit 7b2d039da622daa9ba259ac6f38701d542b237c3 upstream.
In the vfio_ap_irq_enable function, after the page containing the notification indicator byte (NIB) is pinned, the function attempts to register the guest ISC. If registration fails, the function sets the status response code and returns without unpinning the page containing the NIB. In order to avoid a memory leak, the NIB should be unpinned before returning from the vfio_ap_irq_enable function.
Co-developed-by: Janosch Frank frankja@linux.ibm.com Signed-off-by: Janosch Frank frankja@linux.ibm.com Signed-off-by: Anthony Krowiak akrowiak@linux.ibm.com Reviewed-by: Matthew Rosato mjrosato@linux.ibm.com Fixes: 783f0a3ccd79 ("s390/vfio-ap: add s390dbf logging to the vfio_ap_irq_enable function") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231109164427.460493-2-akrowiak@linux.ibm.com Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/crypto/vfio_ap_ops.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -425,6 +425,7 @@ static struct ap_queue_status vfio_ap_ir VFIO_AP_DBF_WARN("%s: gisc registration failed: nisc=%d, isc=%d, apqn=%#04x\n", __func__, nisc, isc, q->apqn);
+ vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1); status.response_code = AP_RESPONSE_INVALID_GISA; return status; }