[PATCH v2 5/7] gstreamer: Fix leak of GstQuery and GstBufferPool in error path

[Laurent Pinchart]

On Wed, Jun 04, 2025 at 03:36:34PM +0200, Barnabás Pőcze wrote:
> 2025. 06. 04. 15:07 keltezéssel, Laurent Pinchart írta:
> > The gst_libcamera_create_video_pool() function leaks a GstQuery instance
> > and a GstBufferPool instance in an error path. Fix the leaks with
> > g_autoptr().
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >   src/gstreamer/gstlibcamerasrc.cpp | 7 +++----
> >   1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp
> > index 9c0ee491ab63..0be64dd836ca 100644
> > --- a/src/gstreamer/gstlibcamerasrc.cpp
> > +++ b/src/gstreamer/gstlibcamerasrc.cpp
> > @@ -541,9 +541,9 @@ static std::tuple<GstBufferPool *, int>
> >   gst_libcamera_create_video_pool(GstLibcameraSrc *self, GstPad *srcpad,
> >   				GstCaps *caps, const GstVideoInfo *info)
> >   {
> > -	GstQuery *query = NULL;
> > +	g_autoptr(GstQuery) query = NULL;
> > +	g_autoptr(GstBufferPool) pool = NULL;
> >   	const gboolean need_pool = true;
> > -	GstBufferPool *pool = NULL;
> >   
> >   	/*
> >   	 * Get the peer allocation hints to check if it supports the meta API.
> > @@ -587,8 +587,7 @@ gst_libcamera_create_video_pool(GstLibcameraSrc *self, GstPad *srcpad,
> >   		return { NULL, -EINVAL };
> >   	}
> >   
> > -	gst_query_unref(query);
> > -	return { pool, 0 };
> > +	return { reinterpret_cast<GstBufferPool *>(g_steal_pointer(&pool)), 0 };
> 
> `std::exchange(pool, nullptr)` ? I used that in https://patchwork.libcamera.org/patch/22455/
> because `g_steal_pointer()` only preserves the type since glib 2.68.

Good idea. I'll use that.

> Reviewed-by: Barnabás Pőcze <barnabas.pocze at ideasonboard.com>
> 
> >   }
> >   
> >   /* Must be called with stream_lock held. */

-- 
Regards,

Laurent Pinchart