linux-ext4 - Re: [PATCH] debugfs: don't try to fclose NULL

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Message-ID: <20090630163956.GE7398@mit.edu>
Date:	Tue, 30 Jun 2009 12:39:56 -0400
From:	Theodore Tso <tytso@....edu>
To:	Thierry Vignaud <tvignaud@...driva.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] debugfs: don't try to fclose NULL

On Tue, Jun 30, 2009 at 05:44:55PM +0200, Thierry Vignaud wrote:
> Eric Sandeen <sandeen@...hat.com> writes:
> 
> > do_logdump may jump to errout if fopen(out_file) fails, 
> > but in that case out_file is NULL, and fclose will segfault.
> 
> You should report that segfault to glibc authors too.

It would be robust for glibc to code fclose() defensively such that it
would survive a null pointer, but I don't think it's technically
required by the ANSI or POSIX spec.

						- Ted
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