[Mesa-dev] [PATCH 2/2] glx/dri3: handle NULL pointers in loader-to-DRI3 drawable conversion

[Marek Olšák]

For the series:

Reviewed-by: Marek Olšák <marek.olsak at amd.com>

Marek

On Fri, Jan 27, 2017 at 11:59 AM, Nicolai Hähnle <nhaehnle at gmail.com> wrote:
> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
>
> With the previous patch, we can now get NULL loaderPrivates, e.g. when
> a DRIdrawable is flushed whose corresponding GLXDRIdrawable was destroyed.
> This resulted in a crash, since the loader vs. DRI3 drawable structures
> have a non-zero offset.
>
> Fixes glx-visuals-depth/stencil -pixmap
>
> Cc: 17.0 <mesa-stable at lists.freedesktop.org>
> ---
>  src/glx/dri3_glx.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
> index 4472a0b..f7bcba3 100644
> --- a/src/glx/dri3_glx.c
> +++ b/src/glx/dri3_glx.c
> @@ -74,20 +74,22 @@
>  #include <sys/time.h>
>
>  #include "dri_common.h"
>  #include "dri3_priv.h"
>  #include "loader.h"
>  #include "dri2.h"
>
>  static struct dri3_drawable *
>  loader_drawable_to_dri3_drawable(struct loader_dri3_drawable *draw) {
>     size_t offset = offsetof(struct dri3_drawable, loader_drawable);
> +   if (!draw)
> +      return NULL;
>     return (struct dri3_drawable *)(((void*) draw) - offset);
>  }
>
>  static int
>  glx_dri3_get_swap_interval(struct loader_dri3_drawable *draw)
>  {
>     struct dri3_drawable *priv = loader_drawable_to_dri3_drawable(draw);
>
>     return priv->swap_interval;
>  }
> --
> 2.7.4
>
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