Subject: Re: [PATCH] quickfetch(): Prevent overflow of the rev-list command line

From: Johan Herland <[email-masked]>
Date: Thu, 09 Jul 2009 10:37:41 +0200

On Thursday 09 July 2009, Alex Riesen wrote:
> On Wed, Jul 8, 2009 at 18:01, Johan Herland<[email-masked]> wrote:
> > On Wednesday 08 July 2009, Johannes Sixt wrote:
> >> ... don't you get this error message with errno set to EPIPE?
> >> Previously, there was no error message.
> >
> > Indeed, you are correct. I guess the following should be added to the
> > patch:
> >
> >        if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) <
> > 0 || write_in_full(revlist.in, "\n", 1) < 0) {
> > -               error("failed write to rev-list");
> > -               err = errno;
> > +               if (errno != EPIPE) {
> > +                       error("failed write to rev-list");
> > +                       err = errno;
>
> You'll loose errno this way: error() does not save it.

Not sure what you mean here. Should I move "err = errno;" outside the 
innermost "if"?

>>From my POV, if errno != EPIPE, we save it into err, and return that 
(overridden by finish_command()'s return value, if non-zero). If errno == 
EPIPE, we're not interested in saving it, because we expect finish_command() 
to return non-zero in any case.

...Johan

-- 
Johan Herland, <[email-masked]>
www.herland.net