Re: [Qemu-trivial] [PATCH] curl: Don't set curl options on the handle just before it's going to be deleted.

[Michael Tokarev <mjt@tls.msk.ru>]

10.06.2013 17:19, Richard W.M. Jones wrote:
> From: "Richard W.M. Jones" <rjones@redhat.com>
> 
> (Found by Kamil Dudka)
> 
> Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
> ---
>  block/curl.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/block/curl.c b/block/curl.c
> index b634ccf..bf31efe 100644
> --- a/block/curl.c
> +++ b/block/curl.c
> @@ -453,7 +453,6 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags)
>          goto out;
>      curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
>      curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb);
> -    curl_easy_setopt(state->curl, CURLOPT_NOBODY, 0);
>      if (d)
>          s->len = (size_t)d;
>      else if(!s->len)

Adding a bit more context:


    curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
    curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_size_cb);
    if (curl_easy_perform(state->curl))
        goto out;
    curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
    curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb);
=>> curl_easy_setopt(state->curl, CURLOPT_NOBODY, 0);
    if (d)
        s->len = (size_t)d;
    else if(!s->len)
        goto out;
    DPRINTF("CURL: Size = %zd\n", s->len);

    curl_clean_state(state);
    curl_easy_cleanup(state->curl);
    state->curl = NULL;

So indeed, the curl object is being removed here a few lines down the code.

But it looks like the previous call to curl_easy_setopt, to set WRITEFUNCTION,
is also not very useful. Should we probably want to remove that too, or don't
remove either of these?

Thanks,

/mjt