Re: [PATCH 3/4] char-socket: avoid double call tcp_chr_free_connection

[Marc-André Lureau]

Hi

On Wed, Apr 15, 2020 at 5:31 AM Li Feng <address@hidden> wrote:
>
> double call tcp_chr_free_connection generates a crash.
>
> Signed-off-by: Li Feng <address@hidden>

Could you describe how you reach the "double call".

Even better would be to write a test for it in tests/test-char.c

thanks

> ---
>  chardev/char-socket.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/chardev/char-socket.c b/chardev/char-socket.c
> index 185fe38dda..43aab8f24b 100644
> --- a/chardev/char-socket.c
> +++ b/chardev/char-socket.c
> @@ -476,6 +476,11 @@ static void tcp_chr_disconnect_locked(Chardev *chr)
>      SocketChardev *s = SOCKET_CHARDEV(chr);
>      bool emit_close = s->state == TCP_CHARDEV_STATE_CONNECTED;
>
> +    /* avoid re-enter when socket read/write error and disconnect event. */
> +    if (s->state == TCP_CHARDEV_STATE_DISCONNECTED) {
> +        return;
> +    }
> +
>      tcp_chr_free_connection(chr);
>
>      if (s->listener) {
> --
> 2.11.0
>
>
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-- 
Marc-André Lureau