From: Bart Schaefer <schaefer@brasslantern.com>
To: "Jun. T" <takimoto-j@kba.biglobe.ne.jp>
Cc: zsh-workers@zsh.org
Subject: Re: D04parameter.ztst crashes if USE_MMAP is not defined
Date: Wed, 28 Feb 2024 20:19:53 -0800 [thread overview]
Message-ID: <CAH+w=7aSyJuFASHnKexhn=ffxvygO78vG_af1uV5KEdSBQBF5A@mail.gmail.com> (raw)
In-Reply-To: <5A8A5063-D43C-4AD0-A03E-0A5E84259FFA@kba.biglobe.ne.jp>
On Wed, Feb 28, 2024 at 8:23 AM Jun. T <takimoto-j@kba.biglobe.ne.jp> wrote:
>
> line 4322 in subst.c is:
> xlen = strlen(x);
> It seems x (= aval[0]) points to an already freed memory
If I step through this with gdb, x should point to the result of
dupstring("") from
3823 val = dupstring("");
(gdb) p aval
$19 = (char **) 0x7ffff7fbc4a0
(gdb) p val
$21 = 0x7ffff7fbc4a8 ""
(gdb) p x
$22 = 0x7ffff7fbc4a8 ""
0x7ffff7fbc4a0 is returned from hcalloc() here:
3945 return pm->u.str ? pm->u.str : (char *) hcalloc(1);
However, getting there is a bit questionable:
getvaluearr (v=0x7fffffffd120) at params.c:686
689 else if (PM_TYPE(v->pm->node.flags) == PM_ARRAY)
690 return v->arr = v->pm->gsu.a->getfn(v->pm);
(gdb) s
strgetfn (pm=0x5555555ebd95 <fetchvalue+1539>) at params.c:3944
Why is gsu.a->getfn pointed at strgetfn ? I could imagine that does
the wrong thing from time to time.
next prev parent reply other threads:[~2024-02-29 4:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-28 16:23 Jun. T
2024-02-29 2:41 ` Bart Schaefer
2024-02-29 4:19 ` Bart Schaefer [this message]
2024-03-01 9:57 ` Jun T
2024-03-03 5:33 ` Bart Schaefer
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