* [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
@ 2022-11-08 2:04 ChunyouTang
0 siblings, 0 replies; 6+ messages in thread
From: ChunyouTang @ 2022-11-08 2:04 UTC (permalink / raw)
To: maarten.lankhorst, mripard, tzimmermann, airlied, daniel
Cc: dri-devel, ChunyouTang
when goto err_free, the object had init, so it should be release when fail.
Signed-off-by: ChunyouTang <tangchunyou@163.com>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 35138f8a375c..2e5e3207355f 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -104,10 +104,10 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
return shmem;
-err_release:
- drm_gem_object_release(obj);
err_free:
kfree(obj);
+err_release:
+ drm_gem_object_release(obj);
return ERR_PTR(ret);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
2022-11-09 9:07 ` Chunyou Tang
@ 2022-11-10 9:09 ` Thomas Zimmermann
0 siblings, 0 replies; 6+ messages in thread
From: Thomas Zimmermann @ 2022-11-10 9:09 UTC (permalink / raw)
To: Chunyou Tang; +Cc: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 2993 bytes --]
Hi
Am 09.11.22 um 10:07 schrieb Chunyou Tang:
> Hi,
>
> drm_gem_object_init() will do these before failed:
>
> void drm_gem_private_object_init(struct drm_device *dev,
> struct drm_gem_object *obj, size_t
> size) {
> BUG_ON((size & (PAGE_SIZE - 1)) != 0);
>
> obj->dev = dev;
> obj->filp = NULL;
>
> kref_init(&obj->refcount);
> obj->handle_count = 0;
> obj->size = size;
> dma_resv_init(&obj->_resv);
> if (!obj->resv)
> obj->resv = &obj->_resv;
>
> drm_vma_node_reset(&obj->vma_node);
> INIT_LIST_HEAD(&obj->lru_node);
> }
>
> so I think when it failed, should use drm_gem_object_release()
> to do dma_resv_fini() and others.
Thanks for bringing this up. We should indeed call dma_resv_fini(), but
not via drm_gem_object_relaese(). If the branch at [1] has an error, it
should call dma_resv_fini() so that the GEM object is still
uninitialized and can be freed.
IMHO it would make sense to introduce drm_gem_private_object_fini() to
revert the effects of drm_gem_private_object_init().
Best regards
Thomas
[1]
https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/drm_gem.c#L133
>
> another, if drm_gem_object_init() fails, the drm_gem_handle_create()
> can not be called.
>
> 于 Tue, 8 Nov 2022 09:28:34 +0100
> Thomas Zimmermann <tzimmermann@suse.de> 写道:
>
>> Hi
>>
>> Am 08.11.22 um 03:03 schrieb ChunyouTang:
>>> when goto err_free, the object had init, so it should be release
>>> when fail.
>>
>> If the call to drm_gem_object_init() fails, the object is still
>> uninitialized. Admittedly, the call to gem_create_object could need
>> additional cleanup, but it appears as if no one has had a need for
>> this so far.
>>
>> Is there anything that might leak?
>>
>>>
>>> Signed-off-by: ChunyouTang <tangchunyou@163.com>
>>> ---
>>> drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c
>>> b/drivers/gpu/drm/drm_gem_shmem_helper.c index
>>> 35138f8a375c..2e5e3207355f 100644 ---
>>> a/drivers/gpu/drm/drm_gem_shmem_helper.c +++
>>> b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -104,10 +104,10 @@
>>> __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool
>>> private) return shmem;
>>>
>>> -err_release:
>>> - drm_gem_object_release(obj);
>>> err_free:
>>> kfree(obj);
>>> +err_release:
>>> + drm_gem_object_release(obj);
>>
>> You have now freed the object's memory before releasing it. Not going
>> to work.
>>
>> Best regards
>> Thomas
>>
>>>
>>> return ERR_PTR(ret);
>>> }
>>
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
2022-11-08 8:28 ` Thomas Zimmermann
@ 2022-11-09 9:07 ` Chunyou Tang
2022-11-10 9:09 ` Thomas Zimmermann
0 siblings, 1 reply; 6+ messages in thread
From: Chunyou Tang @ 2022-11-09 9:07 UTC (permalink / raw)
To: Thomas Zimmermann; +Cc: dri-devel
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=GB18030, Size: 2093 bytes --]
Hi,
drm_gem_object_init() will do these before failed:
void drm_gem_private_object_init(struct drm_device *dev,
struct drm_gem_object *obj, size_t
size) {
BUG_ON((size & (PAGE_SIZE - 1)) != 0);
obj->dev = dev;
obj->filp = NULL;
kref_init(&obj->refcount);
obj->handle_count = 0;
obj->size = size;
dma_resv_init(&obj->_resv);
if (!obj->resv)
obj->resv = &obj->_resv;
drm_vma_node_reset(&obj->vma_node);
INIT_LIST_HEAD(&obj->lru_node);
}
so I think when it failed, should use drm_gem_object_release()
to do dma_resv_fini() and others.
another, if drm_gem_object_init() fails, the drm_gem_handle_create()
can not be called.
ÓÚ Tue, 8 Nov 2022 09:28:34 +0100
Thomas Zimmermann <tzimmermann@suse.de> дµÀ:
> Hi
>
> Am 08.11.22 um 03:03 schrieb ChunyouTang:
> > when goto err_free, the object had init, so it should be release
> > when fail.
>
> If the call to drm_gem_object_init() fails, the object is still
> uninitialized. Admittedly, the call to gem_create_object could need
> additional cleanup, but it appears as if no one has had a need for
> this so far.
>
> Is there anything that might leak?
>
> >
> > Signed-off-by: ChunyouTang <tangchunyou@163.com>
> > ---
> > drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c
> > b/drivers/gpu/drm/drm_gem_shmem_helper.c index
> > 35138f8a375c..2e5e3207355f 100644 ---
> > a/drivers/gpu/drm/drm_gem_shmem_helper.c +++
> > b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -104,10 +104,10 @@
> > __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool
> > private) return shmem;
> >
> > -err_release:
> > - drm_gem_object_release(obj);
> > err_free:
> > kfree(obj);
> > +err_release:
> > + drm_gem_object_release(obj);
>
> You have now freed the object's memory before releasing it. Not going
> to work.
>
> Best regards
> Thomas
>
> >
> > return ERR_PTR(ret);
> > }
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
2022-11-08 2:03 ChunyouTang
@ 2022-11-08 8:28 ` Thomas Zimmermann
2022-11-09 9:07 ` Chunyou Tang
0 siblings, 1 reply; 6+ messages in thread
From: Thomas Zimmermann @ 2022-11-08 8:28 UTC (permalink / raw)
To: ChunyouTang, maarten.lankhorst, mripard, airlied, daniel; +Cc: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 1402 bytes --]
Hi
Am 08.11.22 um 03:03 schrieb ChunyouTang:
> when goto err_free, the object had init, so it should be release when fail.
If the call to drm_gem_object_init() fails, the object is still
uninitialized. Admittedly, the call to gem_create_object could need
additional cleanup, but it appears as if no one has had a need for this
so far.
Is there anything that might leak?
>
> Signed-off-by: ChunyouTang <tangchunyou@163.com>
> ---
> drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 35138f8a375c..2e5e3207355f 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -104,10 +104,10 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
>
> return shmem;
>
> -err_release:
> - drm_gem_object_release(obj);
> err_free:
> kfree(obj);
> +err_release:
> + drm_gem_object_release(obj);
You have now freed the object's memory before releasing it. Not going to
work.
Best regards
Thomas
>
> return ERR_PTR(ret);
> }
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
@ 2022-11-08 2:25 ChunyouTang
0 siblings, 0 replies; 6+ messages in thread
From: ChunyouTang @ 2022-11-08 2:25 UTC (permalink / raw)
To: maarten.lankhorst, mripard, tzimmermann, airlied, daniel
Cc: dri-devel, ChunyouTang
when goto err_free, the object had init, so it should be release when fail.
Signed-off-by: ChunyouTang <tangchunyou@163.com>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 35138f8a375c..2e5e3207355f 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -104,10 +104,10 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
return shmem;
-err_release:
- drm_gem_object_release(obj);
err_free:
kfree(obj);
+err_release:
+ drm_gem_object_release(obj);
return ERR_PTR(ret);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] drm/gem-shmem: When drm_gem_object_init failed, should release object
@ 2022-11-08 2:03 ChunyouTang
2022-11-08 8:28 ` Thomas Zimmermann
0 siblings, 1 reply; 6+ messages in thread
From: ChunyouTang @ 2022-11-08 2:03 UTC (permalink / raw)
To: maarten.lankhorst, mripard, tzimmermann, airlied, daniel
Cc: dri-devel, ChunyouTang
when goto err_free, the object had init, so it should be release when fail.
Signed-off-by: ChunyouTang <tangchunyou@163.com>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 35138f8a375c..2e5e3207355f 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -104,10 +104,10 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
return shmem;
-err_release:
- drm_gem_object_release(obj);
err_free:
kfree(obj);
+err_release:
+ drm_gem_object_release(obj);
return ERR_PTR(ret);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
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2022-11-08 8:28 ` Thomas Zimmermann
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