[PATCH] drm: Release reference from blob lookup after replacing property

[PATCH] drm: Release reference from blob lookup after replacing property

[Chris Wilson]

drm_property_lookup_blob() returns a reference to the returned blob, and
drm_atomic_replace_property_blob() takes a references to the blob it
stores, so afterwards we are left owning a reference to the new_blob that
we never release, and thus leak memory every time we update a property
such as during drm_atomic_helper_legacy_gamma_set().

Based on a patch by Felix Monninger <felix.monninger@gmail.com>

Reported-by: Felix Monninger <felix.monninger@gmail.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=98420
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_atomic.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 1b5a32df9a9a..3b35ab793100 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -416,19 +416,24 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
 					 ssize_t expected_size,
 					 bool *replaced)
 {
-	struct drm_device *dev = crtc->dev;
 	struct drm_property_blob *new_blob = NULL;
 
 	if (blob_id != 0) {
-		new_blob = drm_property_lookup_blob(dev, blob_id);
+		new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
 		if (new_blob == NULL)
 			return -EINVAL;
-		if (expected_size > 0 && expected_size != new_blob->length)
+
+		if (expected_size > 0 && expected_size != new_blob->length) {
+			drm_property_unreference_blob(new_blob);
 			return -EINVAL;
+		}
 	}
 
 	drm_atomic_replace_property_blob(blob, new_blob, replaced);
 
+	if (new_blob)
+		drm_property_unreference_blob(new_blob);
+
 	return 0;
 }
 
-- 
2.10.1

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✓ Fi.CI.BAT: success for drm: Release reference from blob lookup after replacing property

[Patchwork]

== Series Details ==

Series: drm: Release reference from blob lookup after replacing property
URL   : https://patchwork.freedesktop.org/series/14357/
State : success

== Summary ==

Series 14357v1 drm: Release reference from blob lookup after replacing property
https://patchwork.freedesktop.org/api/1.0/series/14357/revisions/1/mbox/


fi-bdw-5557u     total:246  pass:231  dwarn:0   dfail:0   fail:0   skip:15 
fi-bsw-n3050     total:246  pass:204  dwarn:0   dfail:0   fail:0   skip:42 
fi-bxt-t5700     total:246  pass:216  dwarn:0   dfail:0   fail:0   skip:30 
fi-byt-j1900     total:246  pass:215  dwarn:0   dfail:0   fail:0   skip:31 
fi-byt-n2820     total:246  pass:211  dwarn:0   dfail:0   fail:0   skip:35 
fi-hsw-4770      total:246  pass:224  dwarn:0   dfail:0   fail:0   skip:22 
fi-hsw-4770r     total:246  pass:223  dwarn:0   dfail:0   fail:0   skip:23 
fi-ilk-650       total:246  pass:185  dwarn:0   dfail:0   fail:0   skip:61 
fi-ivb-3520m     total:246  pass:220  dwarn:0   dfail:0   fail:0   skip:26 
fi-ivb-3770      total:246  pass:220  dwarn:0   dfail:0   fail:0   skip:26 
fi-kbl-7200u     total:246  pass:222  dwarn:0   dfail:0   fail:0   skip:24 
fi-skl-6260u     total:246  pass:232  dwarn:0   dfail:0   fail:0   skip:14 
fi-skl-6700hq    total:246  pass:219  dwarn:4   dfail:0   fail:0   skip:23 
fi-skl-6700k     total:246  pass:222  dwarn:1   dfail:0   fail:0   skip:23 
fi-snb-2520m     total:246  pass:209  dwarn:0   dfail:0   fail:0   skip:37 
fi-snb-2600      total:246  pass:208  dwarn:0   dfail:0   fail:0   skip:38 

9e8e859eec7e29c4ef33413560819617a7f9f6bf drm-intel-nightly: 2016y-10m-25d-16h-30m-11s UTC integration manifest
315860c drm: Release reference from blob lookup after replacing property

Full results at https://intel-gfx-ci.01.org/CI/Patchwork_2816/

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_2816/
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Re: [Intel-gfx] [PATCH] drm: Release reference from blob lookup after replacing property

[Sean Paul]

On Tue, Oct 25, 2016 at 3:46 PM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> drm_property_lookup_blob() returns a reference to the returned blob, and
> drm_atomic_replace_property_blob() takes a references to the blob it
> stores, so afterwards we are left owning a reference to the new_blob that
> we never release, and thus leak memory every time we update a property
> such as during drm_atomic_helper_legacy_gamma_set().
>
> Based on a patch by Felix Monninger <felix.monninger@gmail.com>
>
> Reported-by: Felix Monninger <felix.monninger@gmail.com>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=98420
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/drm_atomic.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 1b5a32df9a9a..3b35ab793100 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -416,19 +416,24 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
>                                          ssize_t expected_size,
>                                          bool *replaced)
>  {
> -       struct drm_device *dev = crtc->dev;
>         struct drm_property_blob *new_blob = NULL;
>
>         if (blob_id != 0) {
> -               new_blob = drm_property_lookup_blob(dev, blob_id);
> +               new_blob = drm_property_lookup_blob(crtc->dev, blob_id);

I think this could be further simplified by making use of
drm_property_lookup_blob() returning NULL for blob_id == 0

Then you could do something like:

static int
drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
                                         struct drm_property_blob **old_blob,
                                         uint64_t blob_id,
                                         ssize_t expected_size,
                                         bool *replaced)
{
        struct drm_property_blob *blob = NULL;
        int ret = 0;

        blob = drm_property_lookup_blob(crtc->dev, blob_id);
        if (blob && expected_size > 0 && expected_size != blob->length) {
                        ret = -EINVAL;
                        goto out;
                }
        }

        drm_atomic_replace_property_blob(blob, blob, replaced);
out:
        drm_property_unreference_blob(blob);
        return 0;
}

>                 if (new_blob == NULL)
>                         return -EINVAL;
> -               if (expected_size > 0 && expected_size != new_blob->length)
> +
> +               if (expected_size > 0 && expected_size != new_blob->length) {
> +                       drm_property_unreference_blob(new_blob);
>                         return -EINVAL;
> +               }
>         }
>
>         drm_atomic_replace_property_blob(blob, new_blob, replaced);
>
> +       if (new_blob)
> +               drm_property_unreference_blob(new_blob);
> +
>         return 0;
>  }
>
> --
> 2.10.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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[PATCH v2] drm: Release reference from blob lookup after replacing property

[Chris Wilson]

From: Felix Monninger <felix.monninger@gmail.com>

drm_property_lookup_blob() returns a reference to the returned blob, and
drm_atomic_replace_property_blob() takes a references to the blob it
stores, so afterwards we are left owning a reference to the new_blob that
we never release, and thus leak memory every time we update a property
such as during drm_atomic_helper_legacy_gamma_set().

v2: update credentials, drm_property_unreference_blob() is NULL safe and
NULL is passed consistently to it throughout drm_atomic.c so do so here.

Reported-by: Felix Monninger <felix.monninger@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98420
Signed-off-by: Felix Monninger <felix.monninger@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_atomic.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 1b5a32df9a9a..e0760c138355 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -416,18 +416,21 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
 					 ssize_t expected_size,
 					 bool *replaced)
 {
-	struct drm_device *dev = crtc->dev;
 	struct drm_property_blob *new_blob = NULL;
 
 	if (blob_id != 0) {
-		new_blob = drm_property_lookup_blob(dev, blob_id);
+		new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
 		if (new_blob == NULL)
 			return -EINVAL;
-		if (expected_size > 0 && expected_size != new_blob->length)
+
+		if (expected_size > 0 && expected_size != new_blob->length) {
+			drm_property_unreference_blob(new_blob);
 			return -EINVAL;
+		}
 	}
 
 	drm_atomic_replace_property_blob(blob, new_blob, replaced);
+	drm_property_unreference_blob(new_blob);
 
 	return 0;
 }
-- 
2.10.1

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Re: [Intel-gfx] [PATCH] drm: Release reference from blob lookup after replacing property

[Chris Wilson]

On Tue, Oct 25, 2016 at 05:27:21PM -0400, Sean Paul wrote:
> On Tue, Oct 25, 2016 at 3:46 PM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > drm_property_lookup_blob() returns a reference to the returned blob, and
> > drm_atomic_replace_property_blob() takes a references to the blob it
> > stores, so afterwards we are left owning a reference to the new_blob that
> > we never release, and thus leak memory every time we update a property
> > such as during drm_atomic_helper_legacy_gamma_set().
> >
> > Based on a patch by Felix Monninger <felix.monninger@gmail.com>
> >
> > Reported-by: Felix Monninger <felix.monninger@gmail.com>
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=98420
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > ---
> >  drivers/gpu/drm/drm_atomic.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> > index 1b5a32df9a9a..3b35ab793100 100644
> > --- a/drivers/gpu/drm/drm_atomic.c
> > +++ b/drivers/gpu/drm/drm_atomic.c
> > @@ -416,19 +416,24 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
> >                                          ssize_t expected_size,
> >                                          bool *replaced)
> >  {
> > -       struct drm_device *dev = crtc->dev;
> >         struct drm_property_blob *new_blob = NULL;
> >
> >         if (blob_id != 0) {
> > -               new_blob = drm_property_lookup_blob(dev, blob_id);
> > +               new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
> 
> I think this could be further simplified by making use of
> drm_property_lookup_blob() returning NULL for blob_id == 0
> 
> Then you could do something like:
> 
> static int
> drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
>                                          struct drm_property_blob **old_blob,
>                                          uint64_t blob_id,
>                                          ssize_t expected_size,
>                                          bool *replaced)
> {
>         struct drm_property_blob *blob = NULL;
>         int ret = 0;
> 
>         blob = drm_property_lookup_blob(crtc->dev, blob_id);

Not sure. I think the orignal code would have been clearer as

blob = NULL;
if (id) {
	blob = drm_property_lookup_blob(dev, id);
	if (!blob)
		return -ENOENT;

	if (blob->length != expected_size)
		return -EINVAL;
}

i.e. the code currently reports if the blob_id doesn't match an existing
blob, and only removes the current blob if passed in 0.

Otherwise it becomes like:

        struct drm_property_blob *blob;
        int ret = -EINVAL;

        blob = drm_property_lookup_blob(crtc->dev, blob_id);
        if (!blob_id || 
            (blob && (expected_size == 0 || expected_size == blob->length))) {
                drm_atomic_replace_property_blob(old_blob, blob, replaced);
                ret = 0;
        }
        drm_property_unreference_blob(blob);

for which I'm actually favouring the existing code for the extra whitespace.

If we insisted on a single return path:

        struct drm_property_blob *new_blob = NULL;
        int ret = -EINVAL;

        if (blob_id != 0) {
                new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
                if (new_blob == NULL)
                        goto out;

                if (expected_size > 0 && expected_size != new_blob->length)
                        goto out;
        }

        drm_atomic_replace_property_blob(blob, new_blob, replaced);
        ret = 0;

out:
        drm_property_unreference_blob(new_blob);
        return ret;

-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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✗ Fi.CI.BAT: warning for drm: Release reference from blob lookup after replacing property (rev2)

[Patchwork]

== Series Details ==

Series: drm: Release reference from blob lookup after replacing property (rev2)
URL   : https://patchwork.freedesktop.org/series/14357/
State : warning

== Summary ==

Series 14357v2 drm: Release reference from blob lookup after replacing property
https://patchwork.freedesktop.org/api/1.0/series/14357/revisions/2/mbox/

Test drv_module_reload_basic:
                dmesg-warn -> PASS       (fi-skl-6700hq)
Test gem_exec_suspend:
        Subgroup basic-s3:
                pass       -> DMESG-WARN (fi-skl-6700hq)
Test kms_pipe_crc_basic:
        Subgroup suspend-read-crc-pipe-a:
                pass       -> DMESG-WARN (fi-skl-6700hq)
        Subgroup suspend-read-crc-pipe-b:
                pass       -> DMESG-WARN (fi-skl-6700hq)
        Subgroup suspend-read-crc-pipe-c:
                pass       -> DMESG-WARN (fi-skl-6700hq)

fi-bdw-5557u     total:246  pass:231  dwarn:0   dfail:0   fail:0   skip:15 
fi-bsw-n3050     total:246  pass:204  dwarn:0   dfail:0   fail:0   skip:42 
fi-bxt-t5700     total:246  pass:216  dwarn:0   dfail:0   fail:0   skip:30 
fi-byt-j1900     total:246  pass:215  dwarn:0   dfail:0   fail:0   skip:31 
fi-byt-n2820     total:246  pass:211  dwarn:0   dfail:0   fail:0   skip:35 
fi-hsw-4770      total:246  pass:224  dwarn:0   dfail:0   fail:0   skip:22 
fi-hsw-4770r     total:246  pass:223  dwarn:0   dfail:0   fail:0   skip:23 
fi-ilk-650       total:246  pass:185  dwarn:0   dfail:0   fail:0   skip:61 
fi-ivb-3520m     total:246  pass:220  dwarn:0   dfail:0   fail:0   skip:26 
fi-ivb-3770      total:246  pass:220  dwarn:0   dfail:0   fail:0   skip:26 
fi-kbl-7200u     total:246  pass:222  dwarn:0   dfail:0   fail:0   skip:24 
fi-skl-6260u     total:246  pass:232  dwarn:0   dfail:0   fail:0   skip:14 
fi-skl-6700hq    total:246  pass:219  dwarn:4   dfail:0   fail:0   skip:23 
fi-skl-6700k     total:246  pass:222  dwarn:1   dfail:0   fail:0   skip:23 
fi-skl-6770hq    total:246  pass:232  dwarn:0   dfail:0   fail:0   skip:14 
fi-snb-2520m     total:246  pass:209  dwarn:0   dfail:0   fail:0   skip:37 
fi-snb-2600      total:246  pass:208  dwarn:0   dfail:0   fail:0   skip:38 

f746a2112fbb563743acc132304075706551d123 drm-intel-nightly: 2016y-10m-25d-20h-02m-34s UTC integration manifest
93b519c drm: Release reference from blob lookup after replacing property

Full results at https://intel-gfx-ci.01.org/CI/Patchwork_2817/

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_2817/
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Re: [PATCH v2] drm: Release reference from blob lookup after replacing property

[Ville Syrjälä]

On Tue, Oct 25, 2016 at 10:28:08PM +0100, Chris Wilson wrote:
> From: Felix Monninger <felix.monninger@gmail.com>
> 
> drm_property_lookup_blob() returns a reference to the returned blob, and
> drm_atomic_replace_property_blob() takes a references to the blob it
> stores, so afterwards we are left owning a reference to the new_blob that
> we never release, and thus leak memory every time we update a property
> such as during drm_atomic_helper_legacy_gamma_set().
> 
> v2: update credentials, drm_property_unreference_blob() is NULL safe and
> NULL is passed consistently to it throughout drm_atomic.c so do so here.
> 
> Reported-by: Felix Monninger <felix.monninger@gmail.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98420
> Signed-off-by: Felix Monninger <felix.monninger@gmail.com>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Cc: stable@vger.kernel.org
Fixes: 5488dc16fde7 ("drm: introduce pipe color correction properties")
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

The single return path bikeshed looked OK to me too, so my r-b can
be applied there as well, if people prefer that version.

> ---
>  drivers/gpu/drm/drm_atomic.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 1b5a32df9a9a..e0760c138355 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -416,18 +416,21 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
>  					 ssize_t expected_size,
>  					 bool *replaced)
>  {
> -	struct drm_device *dev = crtc->dev;
>  	struct drm_property_blob *new_blob = NULL;
>  
>  	if (blob_id != 0) {
> -		new_blob = drm_property_lookup_blob(dev, blob_id);
> +		new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
>  		if (new_blob == NULL)
>  			return -EINVAL;
> -		if (expected_size > 0 && expected_size != new_blob->length)
> +
> +		if (expected_size > 0 && expected_size != new_blob->length) {
> +			drm_property_unreference_blob(new_blob);
>  			return -EINVAL;
> +		}
>  	}
>  
>  	drm_atomic_replace_property_blob(blob, new_blob, replaced);
> +	drm_property_unreference_blob(new_blob);
>  
>  	return 0;
>  }
> -- 
> 2.10.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH v2] drm: Release reference from blob lookup after replacing property

[Daniel Vetter]

On Wed, Oct 26, 2016 at 10:48:07AM +0300, Ville Syrjälä wrote:
> On Tue, Oct 25, 2016 at 10:28:08PM +0100, Chris Wilson wrote:
> > From: Felix Monninger <felix.monninger@gmail.com>
> > 
> > drm_property_lookup_blob() returns a reference to the returned blob, and
> > drm_atomic_replace_property_blob() takes a references to the blob it
> > stores, so afterwards we are left owning a reference to the new_blob that
> > we never release, and thus leak memory every time we update a property
> > such as during drm_atomic_helper_legacy_gamma_set().
> > 
> > v2: update credentials, drm_property_unreference_blob() is NULL safe and
> > NULL is passed consistently to it throughout drm_atomic.c so do so here.
> > 
> > Reported-by: Felix Monninger <felix.monninger@gmail.com>
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98420
> > Signed-off-by: Felix Monninger <felix.monninger@gmail.com>
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> 
> Cc: stable@vger.kernel.org
> Fixes: 5488dc16fde7 ("drm: introduce pipe color correction properties")
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> The single return path bikeshed looked OK to me too, so my r-b can
> be applied there as well, if people prefer that version.

Applied to drm-misc-fixes (yes I'm trying out something new).
-Daniel

> 
> > ---
> >  drivers/gpu/drm/drm_atomic.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> > index 1b5a32df9a9a..e0760c138355 100644
> > --- a/drivers/gpu/drm/drm_atomic.c
> > +++ b/drivers/gpu/drm/drm_atomic.c
> > @@ -416,18 +416,21 @@ drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
> >  					 ssize_t expected_size,
> >  					 bool *replaced)
> >  {
> > -	struct drm_device *dev = crtc->dev;
> >  	struct drm_property_blob *new_blob = NULL;
> >  
> >  	if (blob_id != 0) {
> > -		new_blob = drm_property_lookup_blob(dev, blob_id);
> > +		new_blob = drm_property_lookup_blob(crtc->dev, blob_id);
> >  		if (new_blob == NULL)
> >  			return -EINVAL;
> > -		if (expected_size > 0 && expected_size != new_blob->length)
> > +
> > +		if (expected_size > 0 && expected_size != new_blob->length) {
> > +			drm_property_unreference_blob(new_blob);
> >  			return -EINVAL;
> > +		}
> >  	}
> >  
> >  	drm_atomic_replace_property_blob(blob, new_blob, replaced);
> > +	drm_property_unreference_blob(new_blob);
> >  
> >  	return 0;
> >  }
> > -- 
> > 2.10.1
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Ville Syrjälä
> Intel OTC
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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