Re: [Xen-devel] [PATCH] 'dom' error handled, by raising ENOMEM if failure occurs. 'xs_fd' leak handled in success path.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Wed, 2015-10-28 at 03:49 +0530, Lasya wrote:

The description of the patch, that you previously put in a separate
email, should live here.

Also, this is the second version of a patch. That should be evident
from the subject line (something like "[PATCH v2]").

And still about the subject line, it's a bit long. It must contain a
very quick hint at what the patch is about, then all the details go in
the patch description (also called changelog), i.e., right in here. :-)

> Signed-off-by: Lasya Venneti <comethalley61@xxxxxxxxx>
> ---
>  tools/xenstore/init-xenstore-domain.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/xenstore/init-xenstore-domain.c
> b/tools/xenstore/init-xenstore-domain.c
> index 0d12169..b413b09 100644
> --- a/tools/xenstore/init-xenstore-domain.c
> +++ b/tools/xenstore/init-xenstore-domain.c
> @@ -42,6 +42,10 @@ static int build(xc_interface *xch, int argc,
> char** argv)
>       snprintf(cmdline, 512, "--event %d --internal-db", rv);
>  
>       dom = xc_dom_allocate(xch, cmdline, NULL);
> +     if(dom==NULL) {
> +             rv=ENOMEM;
> +             goto err;
> +     }
>
A lot of spaces are missing...

>       rv = xc_dom_kernel_file(dom, argv[1]);
          ^ ^
          | |
          -----------------------------------------------
                                                        |
Just, for instance, compare what you added with this: ---

>       if (rv) goto err;
          ^
          |
          --------
                 |
And with this: ---

> @@ -70,7 +74,8 @@ static int build(xc_interface *xch, int argc,
> char** argv)
>       if (rv) goto err;
>       rv = xc_domain_unpause(xch, domid);
>       if (rv) goto err;
> -
> +     
>
What happened here?

> +     close(xs_fd);
>       return 0;
> 
Also, Wei suggested to send two patches, one for fixing the error
handling for xc_dom_allocate(), and another one for stopping leaking
the fd on the success path.

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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