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ui/virtio-gpu: add and use qemu_create_displaysurface_pixman

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Add a the new qemu_create_displaysurface_pixman function, to create
a DisplaySurface backed by an existing pixman image.  In that case
there is no need to create a new pixman image pointing to the same
backing storage.  We can just use the existing image directly.

This does not only simplify things a bit, but most importantly it
gets the reference counting right, so the backing storage for the
pixman image wouldn't be released underneath us.

Use new function in virtio-gpu, where using it actually fixes
use-after-free crashes.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1459499240-742-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-04-01 10:27:20 +02:00
parent 9628af036f
commit ca58b45fbe
4 changed files with 14 additions and 4 deletions
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11
ui/console.c
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@ -1292,6 +1292,17 @@ DisplaySurface *qemu_create_displaysurface_from(int width, int height,
return surface;
}
DisplaySurface *qemu_create_displaysurface_pixman(pixman_image_t *image)
{
DisplaySurface *surface = g_new0(DisplaySurface, 1);
trace_displaysurface_create_pixman(surface);
surface->format = pixman_image_get_format(image);
surface->image = pixman_image_ref(image);
return surface;
}
static void qemu_unmap_displaysurface_guestmem(pixman_image_t *image,
void *unused)
{