[patch] segfault in sh for bogus redirection

[Simon L. Nielsen]

On 2008.07.15 22:28:52 +0200, Stefan Farfeleder wrote:
> On Mon, Jul 14, 2008 at 01:06:35AM +0200, Simon L. Nielsen wrote:
> > Hey Stefan (and other people familiar with the sh(1) code),
> > 
> > I stumbled on a corner case bug in sh(1) where it segfaults instead of
> > giving a proper error message.  This only happens when you do
> > something stupid, but I thought it should be fixed anyway.
> > 
> > When you redirect to an unset or empty variable things fail:
> > 
> >      $ sh -c 'echo 1 >&$a'
> >      Segmentation fault (core dumped)
[...]
> I don't think your patch is correct.  The value of 'fn.list->text' is
> not properly initialised in eval.c:441 and only NULL by chance.  Try

Ah, ok.  I tried to follow the code some, but it wasn't really obvious
to me what was going on :-).

> this patch instead.  I still need to test it properly though.

Yes, your patch also makes sh fail gracefully.

-- 
Simon L. Nielsen