linux-kernel - Re: ext4: fix memory leak in xattr code.

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Message-ID: <523C69F7.4030903@redhat.com>
Date:	Fri, 20 Sep 2013 10:29:59 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Dave Jones <davej@...hat.com>, tytso@....edu,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ext4: fix memory leak in xattr code.

On 9/20/13 9:29 AM, Dave Jones wrote:
> If we take the 2nd retry path in ext4_expand_extra_isize_ea, we potentionally
> return from the function without having freed these allocations.
> If we don't do the return, we over-write the previous allocation pointers, 
> so we leak either way.
> 
> Spotted with Coverity.
> 
> Signed-off-by: Dave Jones <davej@...oraproject.org>

Looks right to me.

Reviewed-by: Eric Sandeen <sandeen@...hat.com>

Thanks!

-Eric

> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index c081e34..f3a6220 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -1350,6 +1350,8 @@ retry:
>  				    s_min_extra_isize) {
>  					tried_min_extra_isize++;
>  					new_extra_isize = s_min_extra_isize;
> +					kfree(is);
> +					kfree(bs);
>  					goto retry;
>  				}
>  				error = -1;
> --
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