On Thu, Jul 12, 2018 at 11:18:40AM +0200, Noralf Trønnes wrote:
> This fixes a static checker warning:
>
> drivers/gpu/drm/drm_client.c:289 drm_client_buffer_create()
> error: double free of 'buffer'
>
> drm_client_buffer_delete() frees the buffer so remove the extra free.
>
> Fixes: c76f0f7cb546 ("drm: Begin an API for in-kernel clients")
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
You could also put an if (buffer->handle) into drm_client_buffer_delete
and simplify the code even more. handle == 0 is the canonical invalid
handle - all our idr start at 1. But this works too. On either approach:
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/drm_client.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
> index 9b142f58d489..83b294ae3e4e 100644
> --- a/drivers/gpu/drm/drm_client.c
> +++ b/drivers/gpu/drm/drm_client.c
> @@ -242,8 +242,10 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u
> dumb_args.height = height;
> dumb_args.bpp = drm_format_plane_cpp(format, 0) * 8;
> ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
> - if (ret)
> - goto err_free;
> + if (ret) {
> + kfree(buffer);
> + return ERR_PTR(ret);
> + }
>
> buffer->handle = dumb_args.handle;
> buffer->pitch = dumb_args.pitch;
> @@ -276,8 +278,6 @@ drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u
>
> err_delete:
> drm_client_buffer_delete(buffer);
> -err_free:
> - kfree(buffer);
>
> return ERR_PTR(ret);
> }
> --
> 2.15.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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