linux-kernel - Re: [PATCH] Stop docproc segfaulting when SRCTREE isn't set.

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Message-ID: <20071009175132.GB11579@Ahmed>
Date:	Tue, 9 Oct 2007 19:51:33 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Rob Landley <rob@...dley.net>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net
Subject: Re: [PATCH] Stop docproc segfaulting when SRCTREE isn't set.

On Tue, Oct 09, 2007 at 10:24:03AM -0700, Randy Dunlap wrote:
> Ahmed S. Darwish wrote:
> >On Tue, Oct 09, 2007 at 08:55:00AM -0700, Randy Dunlap wrote:
> >>On Tue, 9 Oct 2007 15:03:15 +0200 Ahmed S. Darwish wrote:
> >>
> >>>Hi Rob,
> >>>
> >>>On Tue, Oct 09, 2007 at 01:25:18AM -0500, Rob Landley wrote:
> >>>[...]
> >>>> 	FILE * infile;
> >>>>+
> >>>>+	srctree = getenv("SRCTREE");
> >>>>+	if (!srctree) srctree = getcwd(NULL,0);
> >>>> 	if (argc != 3) {
> >>>> 		usage();
> >>>> 		exit(1);
> >>>$ man getcwd
> >>>
> >>> char *getcwd(char *buf, size_t size);
> >>>      
> >>> As an extension to the POSIX.1 standard, Linux (libc4, libc5, glibc) 
> >>> getcwd() allocates the buffer dynamically using malloc() if buf is NULL 
> >>> on call.
> >>>
> >>>Shouldn't "srctree" be free()ed in case getenv("SRCTREE") failed ?
> >>What is there to free() at that point?  If getenv() fails (i.e.,
> >>the env. variable is not found), it returns NULL.
> >>or do I need another cup of coffee?
> >>
> >
> >I meant if getenv() failed, "srctree = getcwd(NULL, 0)" will let 
> >"srctree" point to a _ malloc()ed _ buffer representing PWD. 
> >As said in the manpage, this buffer needs to be free()ed after usage.
> >Right or I'm the one who needs that cup of coffee :) ?
> 
> so it needs to be freed at program termination, is that what you are
> saying?  That will happen automatically (along with any open files being
> closed, etc.).
> 

I didn't know that leaked mem will be automatically freed at program 
termination. A new info, Thanks!.

-- 
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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