This is a note to let you know that I've just added the patch titled
drm/gem: Fix GEM handle release errors
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-gem-fix-gem-handle-release-errors.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 178c824c3e84750a033b390d8facc9abfb1029ae
Author: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Date: Fri Aug 19 15:28:34 2022 +0800
drm/gem: Fix GEM handle release errors
[ Upstream commit ea2aa97ca37a9044ade001aef71dbc06318e8d44 ]
Currently we are assuming a one to one mapping between dmabuf and
GEM 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@xxxxxxxxxxxxxx/
Another problem is that the imported dmabuf might not always have
gem_obj->dma_buf set, which would cause leaks in
drm_gem_remove_prime_handles().
Let's fix these for now by using handle to find the exact map to remove.
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220819072834.17888-1-jeffy.chen@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 86d670c712867..ad068865ba206 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 1fbbc19f1ac09..7bb98e6a446d0 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 e3f09f18110c7..bd5366b16381b 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;
- rb = prime_fpriv->dmabufs.rb_node;
+ mutex_lock(&prime_fpriv->lock);
+
+ rb = prime_fpriv->handles.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) {
+ member = rb_entry(rb, struct drm_prime_member, handle_rb);
+ 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) {
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)
