Re: libattr - severe memory leaks from attr_copy_file()

From: Eric Sandeen <sandeen@sandeen.net>
To: Zdenek Prikryl <zprikryl@redhat.com>
Cc: xfs@oss.sgi.com
Subject: Re: libattr - severe memory leaks from attr_copy_file()
Date: Thu, 19 Feb 2009 10:31:12 -0600	[thread overview]
Message-ID: <499D8950.9030708@sandeen.net> (raw)
In-Reply-To: <499D0471.6000600@redhat.com>

Zdenek Prikryl wrote:
>> And the variable, text, is assigned straight away before any use,
>> so I missed where the problem is.
>>
>> --Tim
> 
> The memory leak is really there. Look:
> 
> 54 attr_parse_attr_conf(struct error_context *ctx)
> ...
> 66 repeat:
> 67         text = malloc(size_guess + 1);
> 68         if (!text)
> 69                 goto fail;
> 70
> 71         if ((file = fopen(ATTR_CONF, "r")) == NULL) {
> 72                 if (errno == ENOENT)
> 73                         return 0;
> 74                 goto fail;
> 75         }
> 
> Let's say that malloc() on the line 67 success, so we have text != NULL. Then,
> fopen() on the line 71 fails and errno == ENOENT. In that case
> attr_parse_attr_conf() simply returns 0, but text isn't freed. That's the point,
> where memory leaks arise. I rewrote the patch, so now is more simpler.

The patch you attached looks good to me, thanks.

-Eric

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