[Linaro-mm-sig] Re: [PATCH] drm/gem: Fix GEM handle release errors

Am 02.08.22 um 13:33 schrieb Jeffy Chen:

Currently we are assuming a one to one mapping between dmabuf and handle when releasing GEM handles.

But that is not always true, since we would create extra handles for the GEM obj in cases like gem_open() and getfb{,2}().

A similar issue was reported at: https://lore.kernel.org/all/20211105083308.392156-1-jay.xu@rock-chips.com/

Another problem is that the drm_gem_remove_prime_handles() now only remove handle to the exported dmabuf (gem_obj->dma_buf), so the imported ones would leak: WARNING: CPU: 2 PID: 236 at drivers/gpu/drm/drm_prime.c:228 drm_prime_destroy_file_private+0x18/0x24

Let's fix these by using handle to find the exact map to remove.

Signed-off-by: Jeffy Chen jeffy.chen@rock-chips.com

drivers/gpu/drm/drm_gem.c | 17 +---------------- drivers/gpu/drm/drm_internal.h | 4 ++-- drivers/gpu/drm/drm_prime.c | 16 ++++++++++------ 3 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index eb0c2d041f13..ed39da383570 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -168,21 +168,6 @@ void drm_gem_private_object_init(struct drm_device *dev, } EXPORT_SYMBOL(drm_gem_private_object_init); -static void -drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) -{

• /*

• * Note: obj->dma_buf can't disappear as long as we still hold a
  

• * handle reference in obj->handle_count.
  

• */
  

• mutex_lock(&filp->prime.lock);
• if (obj->dma_buf) {

• drm_prime_remove_buf_handle_locked(&filp->prime,
  

• 				   obj->dma_buf);
  

• }
• mutex_unlock(&filp->prime.lock);

-}

• /**
  • drm_gem_object_handle_free - release resources bound to userspace handles
  • @obj: GEM object to clean up.

@@ -253,7 +238,7 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) if (obj->funcs->close) obj->funcs->close(obj, file_priv);

• drm_gem_remove_prime_handles(obj, file_priv);

• drm_prime_remove_buf_handle(&file_priv->prime, id); drm_vma_node_revoke(&obj->vma_node, file_priv);

drm_gem_object_handle_put_unlocked(obj); diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index 1fbbc19f1ac0..7bb98e6a446d 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -74,8 +74,8 @@ int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv); void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv); -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,

• 			struct dma_buf *dma_buf);
  

+void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv,

• 		 uint32_t handle);
  

/* drm_drv.c */ struct drm_minor *drm_minor_acquire(unsigned int minor_id); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index e3f09f18110c..c28518ab62d0 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -190,29 +190,33 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri return -ENOENT; } -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,

• 			struct dma_buf *dma_buf)
  

+void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv,

• 		 uint32_t handle)
  

  { struct rb_node *rb;

• mutex_lock(&prime_fpriv->lock);
• rb = prime_fpriv->dmabufs.rb_node; while (rb) { struct drm_prime_member *member;

member = rb_entry(rb, struct drm_prime_member, dmabuf_rb);

• if (member->dma_buf == dma_buf) {
  

• if (member->handle == handle) {
  rb_erase(&member->handle_rb, &prime_fpriv->handles);
  rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs);
  

• 	dma_buf_put(dma_buf);
  

• 	dma_buf_put(member->dma_buf);
  kfree(member);
  

• 	return;
  

• } else if (member->dma_buf < dma_buf) {
  

• 	break;
  

• } else if (member->handle < handle) {
  

Just to make it clear once more. That change here is completely broken.

The rb is indexed by the dma_buf object, not the handle.

Regards, Christian.

	rb = rb->rb_right;
} else {
	rb = rb->rb_left;
}

}

• mutex_unlock(&prime_fpriv->lock); }

void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)