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Re: Bugfix for issue 1330310 (SIGSEGV in Curl_removeHandleFromPipeline)

From: LÚna´c Lefever <lenaic.lefever_at_gmail.com>
Date: Mon, 20 Apr 2009 15:35:06 +0200

On 20 Apr 2009, at 00:46, Daniel Stenberg wrote:

> On Thu, 16 Apr 2009, LÚna´c Lefever wrote:
>
>> Issue 1330310 somehow got unfixed and made libcurl (7.19.4) crash
>> by doing a double Curl_done on the same connection
>> (Curl_getoff_all_pipelines gets called from Curl_done with conn
>> being NULL).
>
> Ouch. Thanks a lot for your very detailed description and hard work
> on tracking this down.
>
>> I've fixed the bug by keeping the original result in an extra
>> CURLCode variable and check if this variable is equal to
>> CURLE_SEND_ERROR. I'm sure there is a cleaner way to fix this
>> problem than my fast hack.
>
> What about letting the ftp_done() code prioritize the first found
> error code and return that back? Like this patch:
>
> diff -u -r1.506 ftp.c
> --- lib/ftp.c 19 Apr 2009 05:20:04 -0000 1.506
> +++ lib/ftp.c 19 Apr 2009 22:44:06 -0000
> @@ -3185,6 +3185,7 @@
> ftpc->cwdfail = TRUE; /* set this TRUE to prevent us to remember
> the
> current path, as this connection is
> going */
> conn->bits.close = TRUE; /* marked for closure */
> + result = status; /* use the already set error code */
> break;
> }
>
>
> --
>
> / daniel.haxx.se

Yup, I've just checked the code flow for this particular issue. This
is a clean fix for it.
I'm looking forward to a future curl-7.19.5.

Thanks,
LÚna´c
Received on 2009-04-20