drm/amdkfd: Use correct major in devcgroup check

commit 99c7b309472787026ce52fd2bc5d00630567a872 upstream.

The existing code used the major version number of the DRM driver
instead of the device major number of the DRM subsystem for
validating access for a devices cgroup.

This meant that accesses allowed by the devices cgroup weren't
permitted and certain accesses denied by the devices cgroup were
permitted (if they matched the wrong major device number).

Signed-off-by: Lorenz Brun <lorenz@brun.one>
Fixes: 6b855f7b83d2f ("drm/amdkfd: Check against device cgroup")
Reviewed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index c24cad3c64ed250ee280f68bae38152637b78fee..f7cfb8180b71752eb2b89f622000ea5d89aad8ff 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -40,6 +40,7 @@
 #include <drm/drm_file.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_device.h>
+#include <drm/drm_ioctl.h>
 #include <kgd_kfd_interface.h>
 #include <linux/swap.h>
 
@@ -1053,7 +1054,7 @@ static inline int kfd_devcgroup_check_permission(struct kfd_dev *kfd)
 #if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
        struct drm_device *ddev = kfd->ddev;
 
-       return devcgroup_check_permission(DEVCG_DEV_CHAR, ddev->driver->major,
+       return devcgroup_check_permission(DEVCG_DEV_CHAR, DRM_MAJOR,
                                          ddev->render->index,
                                          DEVCG_ACC_WRITE | DEVCG_ACC_READ);
 #else