[PATCH v2] lazymanifest: check more return values in filtercopy

[Martin von Zweigbergk]

Pushed to the clowncopter, thanks!

On Wed, Jan 6, 2016 at 4:14 PM Augie Fackler <raf at durin42.com> wrote:

> # HG changeset patch
> # User Augie Fackler <raf at durin42.com>
> # Date 1451586702 18000
> #      Thu Dec 31 13:31:42 2015 -0500
> # Node ID d1f465b710bca42751366fcf975483aee3593b8d
> # Parent  a23cb402be9b9e6812d084f0d30306c826b6d6a4
> lazymanifest: check more return values in filtercopy
>
> Spotted by Bryan O'Sullivan (and vexingly not the static analyzer I've
> been using.)
>
> diff --git a/mercurial/manifest.c b/mercurial/manifest.c
> --- a/mercurial/manifest.c
> +++ b/mercurial/manifest.c
> @@ -707,11 +707,13 @@ static lazymanifest *lazymanifest_filter
>         copy->pydata = self->pydata;
>         Py_INCREF(self->pydata);
>         for (i = 0; i < self->numlines; i++) {
> -               PyObject *arg = PyString_FromString(self->lines[i].start);
> -               PyObject *arglist = PyTuple_Pack(1, arg);
> -               PyObject *result = PyObject_CallObject(matchfn, arglist);
> +               PyObject *arglist = NULL, *result = NULL;
> +               arglist = Py_BuildValue("(s)", self->lines[i].start);
> +               if (!arglist) {
> +                       return NULL;
> +               }
> +               result = PyObject_CallObject(matchfn, arglist);
>                 Py_DECREF(arglist);
> -               Py_DECREF(arg);
>                 /* if the callback raised an exception, just let it
>                  * through and give up */
>                 if (!result) {
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