[PATCH 5.4 119/134] drm/vkms: Hold gem object while still in-use

From: Greg Kroah-Hartman
Date: Tue Jun 16 2020 - 11:41:00 EST


From: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>

commit 0ea2ea42b31abc1141f2fd3911f952a97d401fcb upstream.

We need to keep the reference to the drm_gem_object
until the last access by vkms_dumb_create.

Therefore, the put the object after it is used.

This fixes a use-after-free issue reported by syzbot.

While here, change vkms_gem_create() symbol to static.

Reported-and-tested-by: syzbot+e3372a2afe1e7ef04bc7@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200427214405.13069-1-ezequiel@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpu/drm/vkms/vkms_drv.h | 5 -----
drivers/gpu/drm/vkms/vkms_gem.c | 11 ++++++-----
2 files changed, 6 insertions(+), 10 deletions(-)

--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -121,11 +121,6 @@ struct drm_plane *vkms_plane_init(struct
enum drm_plane_type type, int index);

/* Gem stuff */
-struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
- struct drm_file *file,
- u32 *handle,
- u64 size);
-
vm_fault_t vkms_gem_fault(struct vm_fault *vmf);

int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
--- a/drivers/gpu/drm/vkms/vkms_gem.c
+++ b/drivers/gpu/drm/vkms/vkms_gem.c
@@ -95,10 +95,10 @@ vm_fault_t vkms_gem_fault(struct vm_faul
return ret;
}

-struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
- struct drm_file *file,
- u32 *handle,
- u64 size)
+static struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
+ struct drm_file *file,
+ u32 *handle,
+ u64 size)
{
struct vkms_gem_object *obj;
int ret;
@@ -111,7 +111,6 @@ struct drm_gem_object *vkms_gem_create(s
return ERR_CAST(obj);

ret = drm_gem_handle_create(file, &obj->gem, handle);
- drm_gem_object_put_unlocked(&obj->gem);
if (ret)
return ERR_PTR(ret);

@@ -140,6 +139,8 @@ int vkms_dumb_create(struct drm_file *fi
args->size = gem_obj->size;
args->pitch = pitch;

+ drm_gem_object_put_unlocked(gem_obj);
+
DRM_DEBUG_DRIVER("Created object of size %lld\n", size);

return 0;