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Re: [PATCH v1] chardev/wctable: don't free the instance in wctablet_chr_


From: Marc-André Lureau
Subject: Re: [PATCH v1] chardev/wctable: don't free the instance in wctablet_chr_finalize
Date: Wed, 17 Nov 2021 18:51:11 +0400

Hi

On Wed, Nov 17, 2021 at 6:25 PM Daniil Tatianin
<d-tatianin@yandex-team.ru> wrote:
>
> Object is supposed to be freed by invoking obj->free, and not
> obj->instance_finalize. This would lead to use-after-free followed by
> double free in object_unref/object_finalize.
>
> Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>

Fixes: 378af96155d62 ("Add wctablet device")

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

> ---
>  chardev/wctablet.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/chardev/wctablet.c b/chardev/wctablet.c
> index e9cb7ca710..fa3c9be04e 100644
> --- a/chardev/wctablet.c
> +++ b/chardev/wctablet.c
> @@ -318,7 +318,6 @@ static void wctablet_chr_finalize(Object *obj)
>      TabletChardev *tablet = WCTABLET_CHARDEV(obj);
>
>      qemu_input_handler_unregister(tablet->hs);
> -    g_free(tablet);
>  }
>
>  static void wctablet_chr_open(Chardev *chr,
> --
> 2.25.1
>




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