linux-kernel - Re: BUG memory leakage at ./security/selinux/hooks.c

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Date:	Sat, 15 Aug 2009 00:17:15 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	iceberg <strakh@...ras.ru>
CC:	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>
Subject: Re: BUG memory leakage at ./security/selinux/hooks.c

Added cc:

On 08/10/09 01:53, iceberg wrote:
> ????????KERNEL_VERSION: 2.6.30.4??
>   

Looks like you got some kind of charset conversion problem going on.

> ????????SUBJECT: ?in function inode_doinit_with_dentry memory is not released 
> on error  path (if rc<0).
> ????????DESCRIBE:
> ????????In ./security/selinux/hooks.c in function inode_doinit_with_dentry:??
> 1. If in the line 1278 we successfully allocate memory and assign it to 
> context variablehen 
> 2. if in the line 1284 getxattr returns -ERANGE and 
> 3. if in the line 1288 getxattr returns rc<0 
> then we go to out_unlock without releasing memory pointed to by context 
> variable.
>
> 1278 ????????????????context?=?kmalloc(len,?GFP_NOFS);
> 1279 ????????????????if?(!context)?{
> 1280 ????????????????????????rc?=?-ENOMEM;
> 1281 ????????????????????????dput(dentry);
> 1282 ????????????????????????goto?out_unlock;
> 1283 ????????????????}
> 1284 ????????????????rc?=?inode->i_op->getxattr(dentry,?XATTR_NAME_SELINUX,
> 1285 ???????????????????????????????????????????context,?len);
> 1286 ????????????????if?(rc?==?-ERANGE)?{
> 1287 ????????????????????????/*?Need?a?larger?buffer.??Query?for?the
> right?size.?*/
> 1288 ????????????????????????rc?=?inode->i_op->getxattr(dentry,
> XATTR_NAME_SELINUX,
> 1289 ???????????????????????????????????????????????????NULL,?0);
> 1290 ????????????????????????if?(rc?<?0)?{
> 1291 ????????????????????????????????dput(dentry);
> 1292 ????????????????????????????????goto?out_unlock;
> 1293 ????????????????????????}
> 1294 ????????????????????????kfree(context);
> 1295 ????????????????????????len?=?rc;
> 1296 ????????????????????????context?=?kmalloc(len,?GFP_NOFS);
> --
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